IF you’ve ever noticed a musty, sour, or damp odour coming from your washing machine, you’re not alone.
According to experts at Plumbworld, unpleasant smells in washing machines are one of the most frequent household complaints.
And many homeowners are surprised to learn that the cause often lies in hidden build-up inside the appliance.
Professional plumber James Clarkson, who has worked on residential and commercial plumbing systems across the UK for over 15 years, explains: “The smell usually comes from trapped detergent residue, fabric softener, and lint mixing with warm, damp conditions.
“This creates the perfect breeding ground for mould and bacteria. Once that builds up behind the drum or in the rubber seal, the machine can quickly start smelling.”
The good news is that fixing the problem doesn’t require expensive cleaners.
James recommends a simple household staple – bicarbonate of soda, which can be picked up for as little as 59p in Sainsbury’s.
“Baking soda is a natural deodoriser and mild abrasive,” he says.
“When you run it through the machine, it helps break down soap scum and neutralises odours without damaging the drum or pipes.
“Most households already have a box in the kitchen cupboard, and it costs about a pound.”
To use it effectively, Clarkson suggests adding a half a cup of baking soda directly into the drum.
Then, run an empty hot wash cycle (60°C or higher).
For extra freshness, you can also add a splash of white vinegar in the detergent drawer to cut through limescale.
This simple routine can be repeated once a month to keep odours at bay.
Plumbworld, bathroom and kitchen expert, adds that it’s not just the drum that causes odours — the rubber door seal and detergent drawer are often culprits too.
“When moisture and detergent residue get trapped in the folds of the seal or in the corners of the drawer, mould can grow quickly,” a Plumbworld spokesperson explains.
“A quick wipe with a cloth soaked in hot soapy water or diluted vinegar can prevent that musty smell from coming back.”
Plumbworld concludes: “Regular upkeep doesn’t just stop the smells — it also helps your washing machine perform better and last longer. Prevention is always cheaper than repair.”
Washing machine checklist
To stop washing machine odours returning, plumber James Clarkson shares a few extra maintenance tips:
Leave the door slightly open after every wash to let the drum dry out.
Remove wet laundry promptly to prevent mildew.
Avoid excess detergent — using too much creates more residue, not cleaner clothes.
Clean the filter regularly, usually found at the bottom of the machine.
“These small habits make a huge difference,” he notes.
“Most people don’t realise their washing machine needs cleaning, but like any other household appliance, it benefits from regular care.”