Quick Answer
A smelly washing machine is almost always caused by biofilm — a build-up of detergent residue, fabric softener and moisture — inside the drum and door seal. Running a hot empty cycle with a washing machine cleaner and wiping the seal dry after each wash eliminates it permanently.
Front loaders are more prone to this than top loaders because their sealed drum design traps more moisture between washes.
That mouldy or musty smell from your washing machine isn't a fault — it's biofilm build-up, and it's completely fixable with the right cleaning routine.
Step-by-Step Fix
- Remove and wash the detergent drawer thoroughly
- Wipe the door seal dry, including inside the fold where water collects
- Run an empty cycle at the highest temperature setting with a washing machine cleaner or white vinegar
- Wipe out the drum and leave the door ajar to dry completely
- Repeat this routine monthly to prevent recurrence
Why the Smell Keeps Coming Back
If the smell returns quickly after cleaning, it usually means moisture isn't being given a chance to evaporate between washes. Leaving the door slightly open after each cycle — rather than closing it immediately — is the single most effective prevention habit.
Prevention Habits
- Use the correct amount of detergent — excess leaves residue behind
- Avoid leaving wet clothes in the drum after a cycle finishes
- Run a hot maintenance cycle monthly even without visible smell
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Frequently Asked Questions
Why does my washing machine smell musty?▼
This is caused by biofilm — a build-up of detergent residue and moisture — inside the drum and door seal, particularly in front loaders.
How do I get rid of the smell permanently?▼
Run a hot empty cycle with a washing machine cleaner, wipe the door seal dry after every wash, and leave the door ajar between loads.
Can I use vinegar instead of a commercial cleaner?▼
Yes — white vinegar run through a hot empty cycle is an effective, low-cost way to break down biofilm build-up.
Is a smelly washing machine a sign of a fault?▼
No — it's almost always a cleaning issue rather than a mechanical fault, and is fully fixable without a technician.
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Dishank Patel
Lead Technician & Founder · DP Electric Melbourne
Dishank Patel has over 10 years of hands-on experience repairing household appliances across Melbourne's eastern suburbs. He holds all required Victorian electrical and gas licensing and has personally repaired thousands of appliances across brands including Bosch, Miele, LG, Samsung, and Fisher & Paykel.