Appliance Spares
Quick answer: Black or pink mould in a front loader’s door seal is caused by trapped moisture, lint and detergent sitting in the rubber folds. To remove it safely, wipe the fold with a cloth, clean it with warm soapy water or a diluted white-vinegar solution, scrub the folds and drain holes with an old toothbrush, then run an empty hot cycle. Avoid neat bleach — it can perish the rubber. If the mould has stained deep into cracked or perished rubber, the seal is past cleaning and should be replaced.
Cleaning the seal is a 20-minute job with things you already have at home. If the rubber turns out to be split or perished, find the right replacement boot for your model or read the door seal replacement guide.
Why mould grows in the door seal
The door boot is the wettest, darkest, least-ventilated part of a front loader. Every wash leaves a film of moisture, lint and detergent residue in the folds of the rubber, and if the door is shut straight after, it never dries out. That warm damp pocket is exactly what mould needs to take hold — which is why the seal, not the drum, is almost always where the black spotting and the musty smell start.
Cold washes and low-suds detergent make it worse, because there’s less heat and less rinsing to keep the film from building up. It’s a maintenance problem, not a fault — and it’s almost entirely preventable once you know the drill.
How to clean mould from the seal
Work through these steps. You’ll need rubber gloves, a cloth, an old toothbrush, and either warm soapy water or a solution of white vinegar and water.
- Unplug the machine and open the door. Pull the folds of the seal back gently so you can see right into them.
- Wipe out the loose gunk. Use a dry or damp cloth to clear lint, hair and slime from the fold before you wet-clean.
- Clean the rubber. Dampen the cloth with warm soapy water or a 1:1 white-vinegar-and-water solution and wipe the whole boot, working into every fold. Vinegar lifts mould and deodorises without attacking the rubber.
- Scrub the stubborn spots. Use the toothbrush on ground-in mould and around the small drain holes at the bottom of the boot, which clog with gunk and hold water. Clear them so the seal can drain and dry.
- Rinse and dry. Wipe the boot down with clean water, then dry it thoroughly with a towel — getting it properly dry is what stops the mould coming straight back.
- Run an empty hot cycle. Close the door and run the hottest wash the machine offers with nothing inside (add a cup of white vinegar to the drum if you like) to flush the drum and hoses.
A note on bleach: neat household bleach can dry out and perish rubber over time, and it doesn’t always lift the staining anyway. If you use it at all, dilute it heavily and rinse well. Warm soapy water and white vinegar are the safer everyday choice for the seal itself.
How to stop mould coming back
Cleaning once won’t keep it away — the habits are what matter.
- Leave the door ajar between washes so the drum and seal can dry out. This is the single most effective habit.
- Wipe the fold dry after a wash, especially after a cold or heavy load.
- Leave the detergent drawer open a little too, and don’t overdose detergent or fabric softener — excess residue feeds mould.
- Run a monthly hot maintenance wash — the hottest empty cycle, or a dedicated tub-clean cycle if your machine has one — to clear build-up you can’t reach.
- Take washing out promptly rather than leaving a damp load sitting in a closed drum.
When the seal is past cleaning
Sometimes a clean won’t cut it. Replace the boot rather than keep scrubbing if you find:
- Mould stained deep into the rubber that won’t lift no matter how you clean it, on a boot that’s also cracked or hardened.
- Splits, tears or perished sections in the rubber — cleaning won’t fix a leak.
- A musty smell that returns within days of a thorough clean and hot cycle, which usually means the mould has colonised cracks in old rubber.
A perished, mould-riddled seal is a cheap and confident DIY replacement. Match your model number on the model sticker inside the door frame to the correct boot for your brand:
Not sure which fits? The Part Finder matches your model to the right seal.
Parts that fix this
In stock now and dispatched the same day from Sydney. Not sure which one fits your model? Run your model through the part finder and we will confirm before you order.
Frequently asked questions
Does bleach damage a washing machine door seal?
Neat bleach can, over time — it dries and perishes the rubber. If you use bleach, dilute it heavily and rinse thoroughly. Warm soapy water or diluted white vinegar is safer for regular cleaning of the seal.
Why does my washing machine smell musty even after cleaning?
The mould is usually still living in the fold, the drain holes, or in cracks in old rubber. Clean the drain holes with a toothbrush, run a hot empty cycle, and leave the door ajar. If the smell keeps returning, the seal may be perished and need replacing.
Will removing the mould stop my machine leaking?
Sometimes. A thick band of mould can hold the door open a fraction and cause a weep — cleaning it can fix that. If the leak is from a tear or perished rubber, though, you’ll need a new seal.
How often should I clean the door seal?
Wipe the fold dry after heavy or cold washes, and give it a proper clean monthly alongside a hot maintenance cycle. Regular light cleaning beats occasional heavy scrubbing.
Can I use the machine while the seal is mouldy?
You can, but mould can transfer smells to clothes and it will keep spreading. Clean it sooner rather than later, and check the rubber isn’t cracked or leaking while you’re in there.
Related
Disclaimer: this article is general information only and is provided without warranty of any kind. Appliance designs vary between models and production runs — always follow the manufacturer’s instructions, switch off and unplug the appliance before starting any work, and confirm parts against the model number on your appliance’s model sticker. Any repair is undertaken at your own risk and Oz Appliance Spares accepts no liability for injury, loss or damage arising from work performed after reading this guide, to the maximum extent permitted by law. If in doubt, use a qualified technician.
