The problem
The rubber door seal (gasket) on a front-load washing machine is the single most common place mould grows. Its folds trap water, lint and detergent residue after every wash, and because the area stays warm and damp, black mould spots appear within weeks. Left alone, that mould transfers black bits onto your clothes and gives the whole machine a musty smell.
Why the seal gets dirty
- Water pools in the lower fold of the gasket and never fully dries.
- Lint, hair, coins and tissue get trapped in the rubber.
- Liquid detergent and softener leave a sticky residue that feeds mould.
- The door is closed straight after a wash, sealing in moisture.
Step-by-step: cleaning the gasket
- Gear up. Wear gloves and open a window — you will be using cleaning agents and disturbing mould spores.
- Peel back the seal. Gently pull the rubber towards you to expose the hidden lower fold. Remove any trapped objects and wipe out sludge with paper towel.
- Apply a cleaner. Spray a 50/50 white vinegar and water solution, or use a mould-removing washing machine cleaner. For stubborn black spots, make a paste of baking soda and a little water.
- Scrub. Work into every fold with an old toothbrush. Leave the cleaner on for 5–10 minutes.
- Wipe and rinse. Wipe clean with a damp cloth, then dry thoroughly.
- Run a hot empty cycle. Finish with a 90°C maintenance wash to flush loosened residue from the drum.
If the mould won’t come off
Deeply ingrained black staining sometimes will not lift even after scrubbing, because mould has penetrated the rubber. In that case the seal looks clean-ish but stained. As long as it is no longer slimy or smelly it is fine to keep, but a heavily perished or split seal should be replaced.
How to stop it coming back
- After each wash, wipe the seal dry and leave the door ajar.
- Switch from liquid detergent (which leaves more residue) to powder for hot washes.
- Run a monthly hot maintenance wash.
- Never leave wet laundry sitting in the drum.
A clean seal is part of a healthy machine — see our full guide to cleaning the drum and filter, and learn why washing machines start to smell.
When to call a technician
If the gasket is split, perished or pulling away from the drum, or if the machine leaks from the door despite a clean seal, the rubber needs replacing. This is a job best left to an appliance technician unless you are confident with the spring-clamp that holds it in place.