Washing machines are excellent at cleaning clothes and hopeless at cleaning themselves. Every cycle leaves a thin film of detergent, fabric softener and body oil behind, and over a few months that film becomes a home for mould and bacteria. The giveaway is the smell: towels that come out of the machine smelling sour the moment they get damp. Twenty minutes once a month is usually all it takes to avoid it.
Why a Monthly Clean Is Worth the Effort
Most of us wash at 30°C or 40°C these days, which is kinder to clothes and to energy bills, but far less effective at flushing residue out of the machine. Liquid detergents make it worse, because they don't always dissolve fully in short or cool cycles. The result is a slimy layer in the drawer and drum that holds onto dirt and never quite rinses away.
A regular routine also protects the machine itself. Detergent residue clogs the drawer siphon, limescale builds up on the heating element in hard water areas, and a neglected filter can stop the machine draining altogether. None of that is expensive to prevent, and all of it is irritating to fix.
What You'll Need Before You Start
- An old toothbrush and a small bottle brush
- Two or three clean cloths, plus kitchen roll
- Warm water and washing-up liquid
- White vinegar and bicarbonate of soda
- A washing machine cleaner or citric acid descaler (optional, but useful)
- Rubber gloves, and an old towel plus a shallow tray for the filter
Step One: The Detergent Drawer
Take the drawer out
Pull the drawer out until it stops, then look for the release. On most machines you press down on the plastic tab inside the fabric softener compartment, sometimes marked with a small arrow, and slide the drawer free. Some models need a firm squeeze on both sides; a few have a button at the front. If it resists, check the manual rather than forcing it, because those plastic clips snap easily.
Soak everything
Rinse the drawer and leave it to soak in a sink of hot water with a squirt of washing-up liquid and a couple of tablespoons of bicarbonate of soda. Fifteen minutes is plenty. Then scrub the corners, the underside and especially the siphon cap, the little plastic tube that draws softener out. It pulls off on most machines and is usually coated in brown sludge. A toothbrush gets into the crevices properly.
Clean the housing
This is the part people skip, and it's the part that smells. Shine a torch into the empty cavity: you'll often find black mould along the top edge and a crust of hardened powder at the back. Spray with white vinegar or a diluted washing-up liquid solution, leave it for five minutes, then scrub with the toothbrush and wipe out with a damp cloth. Rinse the cloth often. Dry everything before refitting the drawer, because a wet drawer simply starts the mould cycle over again.
Step Two: The Drum, Door Seal and Filter
Wipe the door seal
Peel back the rubber lip of the door seal and look inside. Lint, hair grips, coins and a black film of mould collect in that fold, and it's the single most common source of washing machine smell. Wipe all the way round with a cloth dipped in warm soapy water or diluted vinegar, pull out any debris, then dry the rubber thoroughly. Do this monthly and the seal will last longer, too.
Run a hot maintenance wash
With the machine empty, add a washing machine cleaner to the drum, or about 100g of bicarbonate of soda, and run the longest, hottest cycle the machine offers. Ninety degrees is ideal if you have it; otherwise choose the hottest cotton programme. Put nothing in the drawer. This flushes residue out of the drum and the pipework behind it.
In hard water areas, swap in a citric acid descaler or a cup of white vinegar every second or third month to keep limescale off the element. Vinegar is acidic, so it's worth alternating rather than using it every single month on rubber seals you'd like to keep supple.
Empty the filter
If your machine has a filter flap at the bottom front, put down an old towel and a shallow tray first. There is always more water than you expect. Unscrew the cap slowly, pull out the filter, remove lint and small objects, rinse it under the tap and screw it back firmly. If the cap won't budge, check the manual; forcing it can crack the housing.
Dealing With Mould and Persistent Odours
If the seal is properly black, a diluted bleach-based cleaner will shift it, but wear gloves, open a window and never mix bleach with vinegar or any acidic cleaner, because the combination releases dangerous fumes. Rinse the rubber well afterwards and leave the door open to dry. For a smell that lingers after cleaning, check the filter and the drain hose area before assuming the worst.
Five Habits That Keep It Clean Between Washes
- Leave the door and the drawer ajar after every wash so air can circulate.
- Measure detergent rather than guessing. Too much is worse than too little.
- Take washing out as soon as the cycle ends; damp laundry left overnight is mould food.
- Wipe the door seal with an old cloth once a week. It takes seconds.
- Run one hot wash a month even if everything else goes on at 30°C.
When the Routine Isn't Enough
If the machine still smells after a proper clean, or water pools under the door, drains slowly or throws up an error code, the problem is likely further in: a blocked drain hose, a worn seal or a failing pump. That's a job for a qualified appliance engineer rather than another bottle of vinegar. If the machine is rented or still under warranty, check the terms before dismantling anything, as some policies require professional servicing.
Otherwise, put the monthly clean in the diary next to the boiler service and the smoke alarm test. Twenty minutes, one hot cycle and an old toothbrush is a small price for laundry that smells of nothing at all.
Photo: RyanMcGuire / Pixabay
