Why Bra Underwires Cause Scraping Noises

The inner drum of a washing machine rotates inside a fixed outer tub. There is a small gap between the two. A bra underwire that escapes from the bra during washing is thin and stiff enough to pass through one of the holes in the drum wall and lodge in this gap. As the drum rotates, the wire scrapes or catches against the outer tub – producing a persistent metallic rasping or scraping sound that occurs on every revolution.

The noise is distinctive – regular, rhythmic, and clearly metallic. It is different from the thumping of an unbalanced load or the grinding of a worn bearing. If the drum makes a light scraping sound consistently as it turns, a foreign object between drum and tub is the most likely cause.

What to Check First

1. Unplug the machine.

   Before investigating any noise inside the drum, always disconnect the machine from the mains supply.

2. Look through the drum holes for the wire.

   Rotate the drum slowly by hand and inspect the holes as they pass. A bra underwire is sometimes visible poking through a hole or caught at the edge of one. Use a torch to see into the gap. If the wire is visible and the end is accessible, it may be possible to hook it back out through the hole with a piece of stiff wire or long-nosed pliers.

3. Check the door seal.

   Items sometimes become trapped in the fold of the door seal rather than passing through the drum holes. Run a finger around the full inner circumference of the seal to check for anything embedded in the rubber.

4. If the wire is not visible – disassembly is required.

   If the wire has fallen fully into the tub space and cannot be seen or reached through the drum holes, the machine needs to be disassembled to retrieve it. This typically involves removing the rear panel or front panel depending on the make. See our guide on how to remove something stuck in a washing machine drum for the full process, or book a repair engineer to do this safely.

How to Prevent It Happening Again

Bra underwires escape during washing when the bra’s casing stitching fails. Once the stitching breaks, the wire can pull out of the fabric channel and pass through a drum hole on the next wash.

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  Wash bras in a mesh laundry bag. A zipped mesh bag keeps the bra contained throughout the wash and prevents the underwire from escaping into the drum even if the casing stitching fails. This is the most reliable prevention method. See our guide on protecting bras when washing.
• 
  Check bra casing stitching regularly. Run a finger along the base channel of each underwired bra before washing. If the stitching has broken or the wire is beginning to poke through, repair or retire the bra before washing it again.
• 
  Use a cooler wash temperature for bras. High temperatures accelerate the breakdown of the delicate fabric and stitching in underwired bras. A 30 or 40 degree wash extends their life significantly.

Related Guides

Washing Machine Is Noisy
Full guide to washing machine noises – scraping, grinding, banging, and rattling, and what each indicates.


Remove Something Stuck in the Drum
How to retrieve items from the tub space when they cannot be reached through the drum holes.


Protecting Bras in the Washing Machine
How to wash underwired bras safely to protect both the garment and the machine.


Washing Machine Pump Filter
Small items can also end up in the pump filter – how to check and clean it.

Frequently Asked Questions

What Biofilm Is and Why It Grows in Soap Dispensers

Biofilm is a colony of bacteria and fungi that forms on surfaces where two conditions are met: moisture and a nutrient source. A washing machine soap dispenser provides both permanently – residual detergent and fabric softener are the nutrient source, and the dispenser is never fully dry between washes.

The growth accelerates in poorly ventilated spaces where the dispenser stays damp for extended periods. Leaving the drawer closed between washes creates exactly these conditions.

Why It Causes Problems Beyond Appearance

Blocked dispenser nozzles

The top of the dispenser recess has small water inlet nozzles that flush detergent into the drum. Biofilm builds up in and around these nozzles, restricting or redirecting the water flow. Blocked nozzles mean detergent is not fully flushed into the drum at the start of the wash.

Fabric softener taken out too early

When nozzles are partially blocked, water is deflected into the fabric softener compartment during the initial fill rather than being directed into the main wash compartments. This causes the softener to be drawn out during the wash cycle rather than the rinse – reducing its effectiveness. See our guide on fabric softener taken out too soon.

Leaking from the drawer

Deflected water can spray towards the front of the dispenser recess and escape under the drawer, appearing as a leak from the soap drawer area. See our guide on washing machine leaking from the drawer.

How to Remove the Biofilm

1. Remove the soap drawer completely.

   Most washing machine drawers have a clip or tab at the back of the fabric softener compartment that, when depressed, allows the drawer to be pulled all the way out. Consult the instruction manual if the release mechanism is not obvious.

2. Clean the drawer.

   Soak the drawer in hot water with a small amount of bleach solution or a commercial bathroom mould remover. Use an old toothbrush to scrub inside all compartments and around any internal channels. Rinse thoroughly before refitting.

3. Clean the dispenser recess inside the machine.

   With the drawer removed, clean the inside of the recess – including the nozzles at the top. Use an old toothbrush dipped in diluted bleach or a mould cleaning spray. Pay particular attention to the nozzle openings as these are where blockages form and where biofilm is most persistent.

4. Run a hot maintenance wash.

   After reassembling, run a maintenance wash at 60 degrees or above with no laundry – either with a machine cleaning product or with soda crystals directly in the drum. This cleans the drum, door seal, and internal components of any related residue. See our guide on washing machine smells and internal cleaning.

If the growth is very established

In severe cases biofilm can be so embedded in the plastic and nozzle channels of the dispenser that cleaning does not fully remove it. If this is the case, a new soap dispenser unit may need fitting. This is a relatively inexpensive spare part for most models – search by model number at Spares4Appliances.

How to Prevent It Returning

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  Leave the drawer open between washes. Even partially open allows air to circulate and the dispenser to dry out. A dry dispenser cannot sustain biofilm growth. This single habit is the most effective prevention measure.
• 
  Wipe the drawer and recess dry after the last wash of the day. A quick wipe with kitchen paper removes the moisture that biofilm needs to survive and multiply.
• 
  Check the inlet valve is not dripping. A water inlet valve that does not close fully leaves a slow constant drip into the dispenser, providing persistent moisture even when the machine is not in use. Remove the drawer and check for water dripping into the recess some time after the machine has finished. If dripping is present, the inlet valve or its filter needs attention.
• 
  Remove and clean the drawer regularly. A monthly clean prevents build-up from becoming established. It also prevents detergent and fabric softener residue hardening in the compartments.

Related Guides

Washing Machine Smells
Causes of grease, slime, and black mould throughout the machine – and how to clean and prevent it.


Washing Machine Leaking From the Drawer
Why water escapes from the soap drawer area – including blocked nozzles and overfilling.


Fabric Softener Taken Out Too Soon
Why softener is pulled into the drum during the wash rather than the rinse – and how blocked nozzles cause this.


Dispenser or Drum – Where to Put Detergent
When putting detergent directly in the drum makes more sense than using the dispenser drawer.

Frequently Asked Questions