Washing at 30 degrees 5 things you need to know
Washing at 30 degrees is widely promoted as an easy way to save money and energy. The advice is not wrong – but it is incomplete. There are important considerations that could easily leave you financially worse off, or with a washing machine that deteriorates faster than it should. Here are five things worth understanding before switching to low temperature washing.
Washing at 30 degrees can save energy, but the savings per wash are smaller than headline percentages suggest. More importantly, washing exclusively at low temperatures can cause grease, slime, and bacteria to build up inside the machine over time – requiring hot maintenance washes that consume energy and potentially shortening the machine’s life. Understanding these trade-offs allows you to use low temperature washing sensibly rather than blindly.
If a garment label specifies 30 degrees, wash at that temperature regardless of this guide. Ignoring wash care labels can permanently damage fabric. The points below apply to everyday cottons and mixed loads where you have a choice of temperature.
1. Your Washing Machine May Not Wash Properly at 30 Degrees
Most washing machines have a 30 degree cycle – but not all 30 degree cycles are the same. Before assuming the machine will wash normal laundry properly at this temperature, it is worth checking what type of 30 degree programme your machine actually offers.
Many machines have a 30 degree setting that is designed specifically for delicates. A delicates cycle is short, uses a very gentle drum action, and ends with a slow spin. This is not suitable for cottons or heavier mixed loads – it will not clean them properly.
To wash everyday laundry effectively at 30 degrees, the machine needs either a dedicated 30 degree cottons programme, or the ability to manually select 30 degrees on a standard cottons wash cycle. Check the instruction manual to confirm which type of 30 degree programme your machine offers and what laundry types it is designed for before switching.
Check the programme guide for the 30 degree setting: what types of laundry is it designed for, and what is the final spin speed? A full-speed spin on a proper cottons programme is a good sign. A slow or gentle spin suggests the 30 degree cycle is intended for delicates only.
2. Low Temperature Washes Have Real Limitations
Washing at 30 degrees works well for lightly soiled everyday laundry. It has genuine limitations that are worth understanding before relying on it as your default temperature.
Heavy stains
Stubborn stains – dried food with strong colour, thick grease, heavy mud, or grass – are unlikely to be removed at 30 degrees. They need either a higher temperature wash or pre-treatment (soaking with detergent or a stain remover) before going in the machine. Washing a heavily stained item at 30 degrees and then having to wash it again at 40 or 60 uses more energy overall than washing it at the right temperature once.
Illness and hygiene items
Laundry from someone who has been ill – underwear, bedding, towels – should be washed at the highest temperature the fabric care label allows, not 30 degrees. Low temperature washes do not kill bacteria and viruses effectively. The same applies to heavily soiled items, cloth nappies, and anything used in contact with raw food.
If you do wash at 30 degrees regularly, treat stains promptly. A fresh stain that might wash out at 30 degrees can become fixed and permanent once it has dried. Pre-treating or rinsing stains before they dry significantly improves results at low temperatures.
3. The Energy Saving Per Wash Is Smaller Than It Sounds
Industry testing has shown that washing at 30 degrees uses around 40% less electricity per cycle than washing at higher temperatures. This sounds significant. In practice, the absolute saving per wash is modest, because the amount of energy a washing machine uses per cycle is already relatively low.
To understand what a percentage saving means in real terms, it helps to look at the actual energy consumption involved. Independent testing has found that the average energy used per wash at 30 degrees is substantially less than at 40 or 60 degrees – but even the difference between 30 and 40 degrees typically amounts to a fraction of a kilowatt-hour per cycle.
At current UK electricity prices, the saving per wash when dropping from 40 to 30 degrees is likely to be only a few pence. Over a year of regular washing that may add up to a few pounds – real money, but not the dramatic saving that percentage figures imply.
While the saving per household is modest, if adopted widely the aggregate energy and carbon saving across millions of households is genuinely significant. This is why low temperature washing is promoted by energy and environmental bodies – the societal benefit is much larger than any individual saving.
4. Washing Mostly at 30 Degrees Can Damage Your Washing Machine
This is the most important point and the one least often mentioned in low temperature washing promotions. Consistently washing at low temperatures causes a progressive build-up of grease, bacteria, soap residue, and black mould inside the machine – in the drum, door seal, sump hose, and internal components.
At higher temperatures, grease and soap residue are dissolved and flushed away. At 30 degrees, they accumulate. This is already a recognised problem for people who wash mostly at 40 degrees. Washing at 30 degrees makes it significantly worse, particularly if liquid detergent is used (which leaves more residue than powder) or if “colour-friendly” detergents are used that lack the enzymes and surfactants needed to clean the machine itself.
Run an empty drum wash at 60 or 90 degrees at least once a month to flush out grease, bacteria, and slime. Without this, the machine will develop smells and internal deterioration that can shorten its working life significantly. See our full guide: causes of grease, slime and black mould inside washing machines.
This creates a genuine trade-off: the energy saved by washing at 30 degrees is partially or fully offset by the energy used in regular maintenance washes. If maintenance washes are neglected, the machine deteriorates – which may lead to earlier replacement, which has a far larger environmental and financial cost than the energy saved by years of low temperature washing.
5. Low Temperature Washing Only Makes Sense With Full Loads
A small load at 30 degrees uses proportionally more water, detergent, and machine wear per item washed than a full load at 40 degrees. If you only have a few items that can be washed at 30 degrees and cannot wait for a full load, it is almost certainly more economical to add them to a normal 40 degree cottons wash.
The energy saving from low temperature washing is based on full load comparisons. Washing small loads frequently – at any temperature – is wasteful. The environmental and financial case for low temperature washing depends on washing full loads every time.
How to Use Low Temperature Washing Sensibly
None of this means washing at 30 degrees is a bad idea – it means it works best when used thoughtfully rather than as a blanket switch.
Check your machine has a proper 30 degree cottons programme – not just a delicates cycle.- Use 30 degrees for lightly soiled, everyday laundry where lower temperature is genuinely sufficient.
- Treat stains before they dry to give low temperature washes a reasonable chance of removing them.
- Wash heavily soiled items, illness laundry, and hygiene items at higher temperatures regardless of the general setting used.
- Run a maintenance wash at 60 or 90 degrees at least monthly – empty drum, with a machine cleaner or a small amount of detergent.
- Always wash full loads to maximise the efficiency of any temperature setting.
Looking for an energy-efficient washing machine?
If saving energy is a priority, the choice of machine matters as much as the temperature setting. Our guide covers what to look for.
Frequently Asked Questions
Does washing at 30 degrees actually save money?
Yes, but less per wash than the headline percentages suggest. The percentage saving is real, but because the absolute energy consumption per cycle is relatively low, the saving per wash amounts to only a few pence. Over a full year it may add up to a few pounds. The saving can be partially or fully offset if you need to run regular maintenance washes at high temperature to keep the machine clean and healthy.
Will my washing machine wash properly at 30 degrees?
It depends on the machine. Most machines have a 30 degree setting, but some are designed for delicates only – a short, gentle cycle with a slow spin that will not clean cottons adequately. Check the instruction manual to confirm whether the 30 degree programme is suitable for everyday laundry, or whether you can manually select 30 degrees on a normal cottons cycle.
Can washing at 30 degrees damage my washing machine?
Not directly – but washing at low temperatures consistently without regular maintenance washes at high temperature leads to a build-up of grease, soap residue, bacteria, and black mould inside the machine. This causes smells, can contaminate laundry, and may shorten the machine’s life. A monthly maintenance wash at 60 or 90 degrees (empty drum) prevents this.
What temperature should I wash at if someone in the house has been ill?
Wash laundry from an ill person at the highest temperature the care label on the garment allows. Low temperature washes do not reliably kill bacteria and viruses. The same applies to towels, bedding, cloth nappies, and anything used for food preparation or in contact with raw food.
How often should I do a maintenance wash if I mostly wash at 30 degrees?
At least once a month. Run the machine empty at 60 degrees (or 90 degrees if the machine allows) with a small amount of detergent or a washing machine cleaner. This dissolves grease and kills bacteria that accumulate at low temperatures. If the machine develops a musty or unpleasant smell, increase the frequency. See our guide: washing machine smells.
Does washing at 30 degrees work with all detergents?
Most modern detergents are formulated to work at lower temperatures and contain enzymes that activate at 30 degrees. However, some older or more basic formulations perform better at higher temperatures. Check the detergent packaging to confirm it is effective at 30 degrees. Powder detergents generally leave less residue in the machine than liquids, which can be a consideration if washing predominantly at low temperatures.
Dishwasher Not Cleaning Dishes Properly
Dishwasher Not Cleaning Dishes Properly
If your dishwasher is completing its cycle but dishes are coming out dirty, greasy, or smelling stale, the cause is almost always one of a small number of common and fixable issues. This guide covers every likely cause in order of how often it occurs, with clear checks for each one, so you can identify and resolve the problem without calling an engineer.
The most common causes of a dishwasher not cleaning properly are: a blocked filter, blocked or jammed spray arms, the detergent compartment not opening, low salt or rinse aid, the wrong wash cycle selected, poor loading, or low-quality detergent. Work through each check below before assuming the machine has a mechanical fault. Most cleaning problems are resolved without an engineer.
How to Diagnose the Problem: What Are You Actually Seeing?
Before working through the checks below, it helps to be specific about what the dirty result looks like. Different symptoms point to different causes.
Suggests the water is not reaching all items effectively. Most likely: blocked filter, blocked spray arms, poor loading, detergent compartment not opening, or wrong cycle selected.
Suggests a salt or rinse aid issue, or hard water mineral deposits. See our dedicated guide: streaks, spots, and lime deposits on dishes and glasses.
Suggests low wash temperature, detergent not dispensing properly, or poor quality detergent. A very short or eco cycle may not be reaching a temperature sufficient to cut through grease effectively.
Suggests a dirty filter or food debris inside the machine. A blocked filter is one of the most common causes of poor dishwasher performance and is entirely user-serviceable without tools.
The Most Common Causes and How to Check Each One
1. Blocked or Dirty Filter
The filter is the single most commonly overlooked cause of poor dishwasher performance. It sits at the bottom of the dishwasher tub and traps food particles to prevent them recirculating onto dishes during the wash. Over time, food debris, grease, and limescale build up in the filter, restricting water flow and causing the machine to wash with dirty, contaminated water.
Most dishwasher filters consist of two parts: a cylindrical mesh filter that twists out, and a flat filter plate beneath it. Both need regular cleaning. Remove them, rinse under a hot tap, and use a soft brush to clear any stubborn deposits. The instruction manual will show how to locate and remove the filter for your specific model.
For a typical household using the dishwasher daily, clean the filter at least once a month. If you wash heavily soiled items or do not pre-rinse, clean it every two weeks. A blocked filter is the most common cause of a dishwasher that used to clean well but has gradually deteriorated.
2. Blocked or Jammed Spray Arms
The spray arms distribute water and detergent throughout the dishwasher during the wash cycle. Most machines have two, one beneath the lower basket and one beneath the upper basket, and some have a third above the upper basket. If a spray arm is blocked or cannot rotate freely, entire sections of the wash load receive little or no water.
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Check rotation. Before running a cycle, spin each spray arm by hand. It should rotate freely with minimal resistance. If it feels stiff or catches, identify what is obstructing it. A tall item in the lower basket is the most common cause of the upper arm being blocked.
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Remove and inspect the arms. Follow the instruction manual to remove each spray arm. Hold each one up to a light and look through every hole along its length. Food particles, particularly seeds, small bones, and softened plastic, are the most common blockages.
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Clear the blockages. Use a toothpick or thin wire to clear each blocked hole. Rinse the arm under a hot tap while covering alternate holes to force water through the blocked ones.
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Refit and test. Refit the spray arms securely and run a cycle. The water jets from these holes are what cause the arms to rotate, so even partial blockages reduce coverage and performance significantly.
3. Detergent Compartment Not Opening
Most dishwashers have a spring-loaded detergent compartment in the door. At a set point during the wash cycle, the cover opens to release the tablet or powder into the water. If a plate, dish, or tray is positioned directly in front of this compartment, the cover cannot open fully, and the detergent either stays inside the compartment or dissolves only partially, significantly reducing cleaning performance.
To check: at the end of a poor-wash cycle, open the door and look inside the detergent compartment. If the tablet is intact or only partially dissolved, the compartment was not opening properly. Ensure the zone directly in front of the detergent compartment is always clear when loading the lower basket.
4. Salt and Rinse Aid Levels
Dishwasher salt regenerates the ion exchange resin in the machine’s built-in water softener. Without sufficient salt, hard water minerals are not removed from the water, which prevents detergent from working effectively and causes limescale accumulation inside the machine. This is particularly important in hard and very hard water areas across much of the UK.
Rinse aid helps water sheet off dishes and glassware cleanly during the final rinse, preventing water spots, streaks, and residue. Check both reservoirs and top them up as needed. Most machines have indicator lights or displays that signal when salt or rinse aid is low, but these indicators can sometimes be slow to respond.
Many all-in-one tablets claim to include salt and rinse aid functionality. However, in hard water areas, separate salt is still strongly recommended even when using multi-tab detergents. Additionally, most dishwashers need to be calibrated to use these tablets properly. Read our guide: have you calibrated your dishwasher for multi-tab detergent?
5. Wrong Wash Cycle Selected
Different programmes offer significantly different wash temperatures, water pressure, and cycle duration. An eco or quick cycle uses less water and energy by washing at a lower temperature for a shorter time. This is appropriate for lightly soiled items but will not effectively clean heavily soiled dishes, pots, or oily items.
Check the instruction manual to understand what each programme is designed for. Use the most appropriate cycle for the load. Pay attention to any option buttons that modify wash intensity, such as an intensive zone, extra dry, or high-temperature options, which are frequently overlooked but can make a significant difference on heavily soiled loads.
6. Poor Loading
Incorrect loading prevents water and detergent from reaching all items. A dish blocking another, a bowl facing the wrong direction, or a large item shielding smaller ones from the spray arms can all cause isolated dirty results. If only one or two specific items regularly come out dirty, poor loading is almost certainly the cause.
Load correctly
Plates facing inward toward the spray arms. Glasses and cups angled so water drains out rather than pooling. No large items blocking the detergent compartment. No items preventing the spray arms from rotating. Cutlery handles down in the basket, knives handles up for safety.
Common loading mistakes
Bowls or cups placed right-side up so they fill with water. Large baking trays or chopping boards positioned in front of the spray arm or detergent compartment. Items nested together so water cannot reach the surfaces between them. Glasses touching and blocking each other.
7. Poor Quality or Wrong Type of Detergent
The quality of dishwasher detergent makes a material difference to wash results. Independent consumer testing consistently shows significant variation in performance between products at different price points. Some budget detergents leave food residue, grease, or marks that better-performing alternatives remove cleanly.
Detergent type also matters. Tablets, powder, and gel behave differently, and some suit particular water hardness levels or machine types better than others. If you have recently switched to a cheaper detergent and noticed a drop in performance, switching back or trying a premium alternative is worth doing before investigating any other cause. See our guide: which is the best dishwasher detergent?
8. Low Water Temperature
Dishwashers heat their own water internally, but the incoming water temperature affects how quickly the target temperature is reached and how long the machine spends at maximum temperature. If the incoming water supply is very cold, or if the machine’s heating element is not performing as it should, wash temperatures may be lower than the selected programme requires.
A dishwasher that cleaned well previously but has gradually deteriorated in performance, with greasy residue appearing more frequently, may have a partially failing heating element. This is more difficult to diagnose at home and, if other causes have been ruled out, is a reason to have an engineer check the machine.
Step-by-Step Diagnostic Checklist
Work through these checks in order before concluding the machine has a mechanical fault.
- Clean the filter. Remove, rinse, and scrub both filter components under a hot tap. This is the most common cause of gradually deteriorating performance.
- Inspect the spray arms. Remove each arm, check rotation is free, and clear any blocked holes. Refit securely.
- Check the detergent compartment. Run a cycle and check whether the tablet has fully dissolved at the end. If not, the compartment lid is being blocked. Rearrange the lower basket to ensure the area in front of it is clear.
- Top up salt and rinse aid. Check both reservoirs and fill if needed. Do not rely solely on indicator lights.
- Select the right programme. Use an intensive or high-temperature programme for heavily soiled loads. Eco and quick cycles are not suitable for all loads.
- Review your loading technique. Ensure all items face the spray arms, nothing blocks the arms from rotating, and no item sits in front of the detergent compartment.
- Try a better detergent. If you are using a budget product, switch to a well-reviewed premium tablet and run a full cycle to compare results.
- Run a maintenance wash. An empty hot cycle with a dishwasher cleaner removes grease, limescale, and odour-causing residue from inside the machine. Do this monthly if the machine is used daily.
When to Call an Engineer
If all of the above checks have been completed and cleaning performance remains poor, a mechanical or electronic fault is more likely. The most probable causes at this point are a failing heating element, a pump that is not circulating water at full pressure, or a water inlet issue causing the machine to wash with insufficient water volume.
These are not user-serviceable faults and require an engineer with appropriate test equipment to diagnose accurately. Before booking, note exactly what the problem is, which cycle was used, and what checks you have already carried out. This helps the engineer diagnose faster and reduces the risk of a wasted visit.
Related Dishwasher Guides
Streaks, spots, and lime deposits on dishes
If the issue is white marks, water spots, or limescale rather than food residue, this dedicated guide covers the specific causes and fixes
Calibrating your dishwasher for multi-tab detergent
Most dishwashers need adjusting when you switch to 3-in-1 or all-in-one tablets. How to do it and why it matters
Which dishwasher detergent is best?
Independent guidance on detergent performance, the difference between tablet, powder, and gel, and what actually produces the best results
All dishwasher guides
The full Whitegoods Help dishwasher section, covering faults, buying advice, error codes, and maintenance
Still not cleaning properly after all the checks?
If you have worked through every check above and the problem persists, a mechanical fault is the likely cause. NAC Repair provides same-day and next-day nationwide dishwasher repairs with transparent pricing and all work guaranteed.
Frequently Asked Questions
Why is my dishwasher not cleaning properly even though it finishes the cycle normally?
If the cycle completes in normal time, the machine itself is working. The most likely causes are: a dirty or blocked filter, blocked spray arm holes, the detergent compartment not opening due to something blocking it, low salt or rinse aid, the wrong wash cycle for the load, poor loading technique, or low-quality detergent. Work through the checklist above before concluding there is a mechanical fault.
How do I check if my dishwasher spray arms are blocked?
Remove the spray arms following the instruction manual for your model. Hold each arm up to a light source and look through every hole. Blocked holes will be visibly obstructed. Clear them with a toothpick or thin wire and rinse the arms under a hot tap. Also check that each arm spins freely before running a cycle, since an item in the baskets can prevent them rotating even if the holes are clear.
Why is my dishwasher tablet not dissolving?
The most common cause is something blocking the detergent compartment cover, preventing it from opening during the wash. A large plate, baking tray, or dish positioned directly in front of the compartment is typically responsible. Ensure the area in front of the detergent compartment is always clear when loading. If you use multi-tab or 3-in-1 tablets, also check whether your dishwasher has been calibrated for this type: calibrating for multi-tab detergent.
Does dishwasher salt really make a difference?
Yes, particularly in hard and very hard water areas. Dishwasher salt regenerates the ion exchange resin in the machine’s built-in water softener. Without it, hard water minerals prevent detergent from working effectively, cause limescale build-up inside the machine, and produce white spots and streaks on dishes. Separate salt is recommended even if you use 3-in-1 tablets that claim to include salt functionality.
How often should I clean my dishwasher filter?
For daily use, clean the filter at least once a month. If you wash heavily soiled items or rarely pre-rinse dishes, clean it every two weeks. A filter that has not been cleaned for several months is often the sole cause of a dishwasher that has gradually started producing worse results. It takes less than five minutes and requires no tools.
Can a cheap detergent really cause poor cleaning results?
Yes. Independent consumer testing consistently shows significant performance differences between dishwasher detergents. Some budget products leave food residue, grease, and marks that better-performing alternatives remove cleanly. If you have recently switched to a cheaper product and noticed a drop in performance, the detergent is likely the cause. See our guide: which is the best dishwasher detergent?
My dishwasher used to clean well but has gradually got worse. What has changed?
Gradual deterioration in cleaning performance almost always indicates a blocked filter or blocked spray arms that have not been cleaned for some time. These build up slowly and the drop in performance is so gradual it can go unnoticed until dishes start coming out visibly dirty. Clean both thoroughly and run a maintenance wash with a dishwasher cleaner product. If performance does not improve, a partially failing pump or heating element may be responsible and an engineer visit is warranted.
Detergent capsules danger to children
Liquid detergent capsules and laundry pods are a serious danger to young children. Their bright colours, soft packaging, and appealing texture make them highly attractive to toddlers – and the concentrated gel inside can cause severe chemical burns to skin, eyes, and the digestive tract in seconds. This article explains the risks and what parents and carers need to know.
Under-5s are most at risk, but older children have also been seriously injured. Never store capsules under the kitchen sink or in an easily accessible cupboard near the washing machine or dishwasher.
The Scale of the Problem
Tens of thousands of children have been hospitalised worldwide as a result of incidents involving liquid detergent capsules. At least one death has been reported internationally, with many hundreds of serious hospitalisations. In the UK, BBC News reported in 2012 that five children in Glasgow alone were admitted to hospital with serious chemical burns in a single year after swallowing or biting into liquid gel detergent tabs.
Among those cases, an 8-month-old baby girl spent four days in intensive care after biting into a capsule. Some burns were described as life-threatening. Most children have recovered, but this is a genuine and ongoing danger.
The most common incidents involve young children – typically under 5 – who:
- Press down on the capsule, causing it to burst and squirt gel into their eyes
- Bite into the capsule, swallowing or inhaling concentrated detergent gel which causes severe internal burns
- Handle the capsule, getting gel on their skin which burns on contact
Even older children can be attracted to the soft, bubble-wrap-like texture of capsules and accidentally pop them open, squirting gel into their eyes.
A Parent’s Account
The following warning was shared by a mother whose child was seriously injured by laundry pods:
“Warning: This is what happened to my little boys skin after bursting laundry pods. They were out of sight, however, my son has special needs and climbed up to get them. The contents of the detergent pods were only on his skin for a very short time before I showered him but the damage was already done. Please, if you have children be so careful with these products. My child has got 2nd degree chemical burns that will require weeks of treatment and he has had to be given morphine for the pain!”
This account illustrates that even with capsules stored out of visible reach, a determined or curious child can find them. “Out of sight” is not the same as safely secured. Only a locked or child-proof cupboard provides reliable protection.
Why Capsules Are So Dangerous
The gel inside liquid detergent capsules is highly concentrated – far more so than liquid or powder detergent in diluted form. It is designed to dissolve in a full machine load of water. When it comes into contact with skin, eyes, or the digestive tract in its concentrated state, the chemical burns it causes can be severe and rapid.
Most parents are unaware of the extent of the danger. The packaging is deliberately made visually appealing and pleasant to handle – which is exactly why young children find them so irresistible.
- Store all capsules in a locked cupboard – not under the sink or in a low accessible drawer, regardless of whether they appear to be “out of sight”.
- Never leave capsules unattended during use – take only what is needed directly to the machine and return the packaging immediately to secure storage.
- Warn older children and grandparents – grandparents who may not be aware of the danger, and older children who may be tempted to play with the packaging.
- Always read and follow the packaging instructions – particularly regarding storage and child safety.
Danger From Undissolved Gel in Laundry
There is a second, less well-known risk associated with liquid detergent capsules: an incompletely dissolved capsule trapped in laundry. If a washing machine is overloaded, laundry can become so tightly packed that the capsule cannot dissolve properly during the wash. Concentrated undiluted gel can remain trapped within folds of fabric.
If laundry washed this way is then placed on or near a child – particularly young babies in vests or babygrows – the gel in contact with skin can cause burns before it is noticed. This type of incident has been reported since capsules became widely available.
To avoid this risk: do not overload the washing machine when using capsules, and always check children’s items carefully before use, particularly if there is any doubt that the capsule fully dissolved during the cycle.
More appliance and household safety
Frequently Asked Questions
Are laundry capsules really that dangerous to children?
Yes – the risk is serious and well-documented. Tens of thousands of incidents involving children and liquid detergent capsules have been reported worldwide, including at least one death and many hundreds of hospitalisations. The concentrated gel inside can cause rapid and severe chemical burns to skin, eyes, and internally if swallowed. Young children under 5 are most at risk, but older children have also been seriously injured.
My capsules are stored out of sight – is that enough?
Not necessarily. Children, particularly those with mobility or curiosity beyond their apparent age, can find and access items that adults consider out of reach. “Out of sight” is not the same as safely secured. The only reliable protection is a locked or genuinely child-proof cupboard. Capsules should not be stored under the kitchen sink or in low, unlocked drawers near the washing machine or dishwasher.
What should I do if a child comes into contact with detergent gel?
If gel contacts skin, rinse immediately with large amounts of cool water for at least 10-15 minutes. If gel contacts the eyes, rinse continuously with water. If any gel has been swallowed, do not induce vomiting – call 999 or go to A&E immediately, bringing the product packaging. Time is critical – do not wait to see if symptoms develop. Chemical burns from concentrated detergent gel can worsen rapidly.
Can detergent capsules leave gel on laundry if the machine is overloaded?
Yes. An overloaded machine can prevent a capsule from dissolving fully, leaving concentrated undiluted gel trapped in folds of laundry. This presents a particular risk with children’s clothing and babywear, where undissolved gel in contact with skin can cause burns before it is noticed. Always leave the washing machine with sufficient space for the capsule to dissolve properly, and check children’s items carefully after washing if there is any doubt.
Are dishwasher tablets or pods the same risk as laundry capsules?
The concentrated nature of the chemical gel means dishwasher pods and tablets carry similar risks if handled by young children. The same storage precautions apply: keep all concentrated dishwasher and laundry products in a locked or fully child-proof location, out of reach and out of sight.
Washing machine detergent from the past
Washing machine detergent choice used to be much simpler. A fascinating old publication from Unilever – operating under the simpler name “Lever” at the time – shows just how much the detergent market has expanded since automatic washing machines became a household staple.
Just Two Types of Detergent for the Washing Machine
The booklet in question was produced by one of the leading detergent manufacturers of the time and was widely distributed with new washing machines. One section refers to a particular wash symbol that will have changed “by 1987”, giving a sense of its era. It is an expensively produced publication with a glossy cover – the kind of quality insert that used to be bundled with major appliance purchases.
What stands out today is how straightforward the choice was. Back then, automatic washing machine detergent came in just two types: an original formulation and a newer biological version. There was also a separate product for hand-washing laundry – a category that has largely disappeared.
How Many Types Are There Now?
The contrast with the modern detergent market is striking. Today, a single major brand may offer over a dozen laundry products, each positioned around a specific benefit – colour protection, whitening, low-temperature performance, sensitive skin, concentrated formats, capsule form, and so on.
Whether this represents genuine improvement or primarily clever marketing is open to debate. The specialised products make a reasonable case – colours do fade, whites do grey, and low-temperature washing is more energy efficient. But the sheer volume of options can also make a simple purchase decision more complicated than it needs to be.
Previously, the choice came down to biological or non-biological, and which brand to favour. That remained the case for decades, and laundry still got clean.
Which? Research on Detergent Performance
Washing machine and dishwasher detergent is a significant household expense. Which? has conducted extensive testing and research on detergent performance – results which vary considerably between products at different price points. Full access to test results requires a Which? membership, though useful background information is available without one. (Take out a Which? trial offer.)
Browse all detergent and softener articles – Biological detergent and skin irritation – Can biological detergents damage laundry?
Dishwasher Making Whistling Noise
A whistling noise during the dishwasher wash cycle can be caused by certain detergent brands. Try running a cycle without detergent to confirm the cause, then switch brands if the noise disappears. If the whistling persists with different detergents or sounds like it is coming from the pump or motor, it needs further investigation.
A dishwasher making a whistling noise during the wash cycle may have an unexpected and trivial cause. Before assuming a mechanical fault, it is worth trying a different brand of detergent first.
Could the Whistling Be Caused by Detergent?
At least one major dishwasher manufacturer includes the following in their instruction manual troubleshooting guide under “malfunctions”:
“If there is a whistling noise during washing. This is not a cause for concern, but to try using a different brand of detergent.”
It appears that some dishwasher detergents can produce a whistling sound during the wash cycle while others do not. No technical explanation is given in the manual for why this occurs.
If the noise does not sound as though it is coming from the motor or pump area, trying a different detergent brand is a sensible first step. It is also worth running a cycle without any detergent at all to see whether the noise is present – this helps confirm whether the detergent is the cause before switching brands.
If the whistling persists with different detergents, or if the noise sounds as though it is coming from a motor, pump, or internal component, it should be investigated further. Some noises indicate more serious faults.
Dishwasher not cleaning dishes properly – Dishwasher safety notices
Setting Up Dishwasher’s Water Hardness Settings
Dishwashers need to be calibrated for local water hardness. Most work adequately on factory defaults, but in hard water areas incorrect settings cause limescale and poor wash results, while in soft water areas the machine may use excess salt. Check the instruction manual for the specific adjustment procedure for your model.
Unlike washing machines, dishwashers need to be set up for the local water hardness level. Factory default settings aim to suit average UK conditions, but water hardness varies significantly from area to area. A dishwasher set for hard water in a soft water area – or vice versa – will not perform as well as it should.
Why Water Hardness Settings Matter
Most dishwashers operate adequately without being calibrated for local water hardness, and owners may not notice any issue. However, problems can become apparent at the extremes:
- In a very hard water area, incorrect settings can cause poor wash results and limescale build-up inside the machine.
- In a very soft water area, the machine may use more salt than necessary, or excessive foaming can occur.
- When using all-in-one multi-tab detergent in a soft water area, it may be possible to stop using rinse aid altogether and save money.
How to Set Up a Dishwasher for Water Hardness
The exact procedure varies between models and manufacturers, so the instruction manual must be consulted. If the original manual is not available, it may be possible to download one via the manufacturer’s website – links to manufacturer manual pages can be found at: instruction books and user manuals.
The Two Typical Adjustments
Many dishwashers have two separate water hardness adjustments that work together:
1. A physical dial or switch – typically located on the lower inner panel of the door, usually just above the salt compartment. This commonly offers two positions (for example, 1 and 2), with the default factory setting at the higher (hard water) position. In a soft water area this can be turned down to the lower setting.
2. An electronic setting – accessed through a button combination that puts the dishwasher into a programming mode, allowing selection from a range of levels (often 1 to 10) corresponding to water hardness ranges listed in a chart in the instruction manual. At the lowest setting, many manuals specify that no salt is needed at all. The exact method varies by model – check the instruction manual for the specific procedure.
There is no universal procedure to describe here as every dishwasher model is different. The instruction manual is the definitive source.
Using Multi-Tab or All-in-One Detergent
If using multi-tab or all-in-one detergent tablets, these are designed to replace separate salt and rinse aid, so the water hardness adjustments described above may not be necessary. However, the dishwasher must still be set up to recognise that this type of detergent is being used – otherwise it may continue attempting to dispense salt and rinse aid in addition to the tablet. See: have you calibrated your dishwasher for multi-tab detergent?
In real-world use, multi-tab detergent does not always fully replace the need for rinse aid – results vary by brand, tablet quality, and local water hardness. In moderately hard water areas in particular, some residual water may collect in the tops of mugs or small indentations on dishes even when using all-in-one tablets. Reintroducing a small amount of rinse aid – with the dispenser set to the minimum dose – can resolve this while still reducing overall rinse aid consumption significantly compared to using standard detergent. In genuinely soft water areas, multi-tab detergent alone is more likely to be fully sufficient. Experimenting with settings based on local water hardness and the specific brand of tablet used is the best approach.
How to Find Out Local Water Hardness
Water hardness information is available from local water suppliers. Most publish this on their websites. A list of water company contact details is available from Ofwat (the water services regulator).
Dishwasher Detergent Tests and Reviews
Which? has tested dishwasher detergents across a range of brands and types. Results vary considerably between products.
Related dishwasher guides
Frequently Asked Questions
Do I need to adjust my dishwasher for water hardness?
Most dishwashers will work adequately without adjustment, but performance may not be optimal. In hard water areas, incorrect settings can cause limescale build-up and poor wash results. In soft water areas, the machine may use more salt than needed or produce excess foaming. Checking and setting the water hardness level according to the instruction manual is good practice, particularly if wash results are disappointing.
Do I still need to use salt and rinse aid if I use multi-tab detergent?
Multi-tab tablets are designed to replace separate salt and rinse aid. In soft water areas, they often work well alone. In moderately hard or hard water areas, some residual water spots or pooling may still occur even with quality multi-tab tablets – in which case adding a small amount of rinse aid at the minimum dispenser setting can help. The dishwasher also needs to be calibrated to know it is using multi-tab detergent. See: calibrating for multi-tab detergent.
How do I find out how hard the water is in my area?
Check with your local water supplier – most publish water hardness data on their websites. A list of water company contact details can be found via Ofwat.
Where can I find the instruction manual for my dishwasher?
If the original manual is not available, most manufacturers make manuals available for download on their websites. Links to manufacturer manual download pages can be found at: instruction books and user manuals.