How White Vinegar and Bicarbonate of Soda Remove Washing Machine Smells

There is a familiar moment when a supposedly fresh wash emerges smelling faintly of wet dog. Sorting it out does not require cupboards full of specialist cleaners or an afternoon spent scrubbing. All it takes is two household staples and a few easy habits you can maintain.

One Tuesday morning, with the bathroom window slightly open beneath a porridge-coloured sky, I took a T-shirt from the drum and stopped. Behind the smell of detergent was that tell-tale musty note. The door seal seemed all right at first, but when I pushed my thumb into its fold, a slick droplet travelled along the edge. The solution is more straightforward than it seems.

Why your washing machine smells in the first place

A washing machine is not dirty in the same way as a bin. Instead, detergent residue, fabric softener, lint and hard-water minerals gradually form a stubborn coating. Microbes feed on this film, and when the door remains closed while the drum is still slightly damp, those microbes create unpleasant smells.

A Bristol neighbour told me that her drum began to smell after a winter of speedy 30°C washes and generous doses of softener. She assumed the fragrance would disguise the issue, but it had the reverse effect: floral perfume combined with a faint pond-like smell. That is how most washing machine odours develop - gradually, rather than because of one isolated error.

In simple chemical terms, white vinegar breaks down mineral scale and soap deposits, loosening the stubborn film. Bicarbonate of soda absorbs odours and shifts the pH nearer to neutral, helping to release what the vinegar has softened. Sending hot water through the machine stops the biofilm from holding on. Bicarbonate of soda and white vinegar are the only two things you need.

The two-ingredient clean: a simple routine

Begin with the machine empty. Add 250–400 ml of white vinegar directly to the drum and select the hottest maintenance cycle available, ideally 60–90°C. Where your model has a pause function, pause the cycle halfway through for 20–30 minutes so the vinegar can sit on the surfaces, then allow the programme to finish.

Then scatter 2–3 tablespoons of bicarbonate of soda into the drum and run a brief hot rinse. Once it has finished, open the door and use a clean cloth to wipe the rubber seal, door glass and inside of the drum. Never mix vinegar with bleach - ever. If you have used bleach recently, wait a day and run a couple of rinses before using this method.

A few small adjustments will help prevent the odour from returning. Use less detergent, avoid fabric softener for towels, and leave the door and detergent drawer open to allow air to circulate. Realistically, no one manages all of this every day. Leave the door and detergent drawer ajar after every wash.

“If your machine smells, it’s not the clothes - it’s the biofilm. Break the film and the smell goes with it,” a repair engineer told me on a call-out in Leeds.

• Monthly: run one hot vinegar cycle, followed by one short bicarb rinse.
• After washing: wipe the inner lip of the door seal, where water collects.
• Use powder for heavily soiled loads; gels may cling more readily.
• Once a season: remove the drain filter and clear away the fluff.
• If you frequently use cold cycles, run at least one 60°C wash each week.

What to expect - and how to keep it easy

Following the first vinegar cycle, the smell will often change from “swampy” to “barely there”. The bicarb rinse generally completes the process, leaving the drum neutral rather than artificially perfumed. If your machine has accumulated years of residue, repeat the routine the following week and inspect the filter for coins, hair ties or matted lint that can hold sour water.

It also helps to look at the task differently. You are not carrying out a deep clean on a faulty appliance; you are keeping a water-based machine dry between baths. Leave the door slightly open, pull the drawer out by a centimetre, and give the seal a two-second wipe as you remove the final sock. These are minor habits, not chores with a capital C.

In hard-water homes, vinegar is a useful ally because it softens scale whenever it circulates through the machine. The routine matters even more for large families, as extra loads create more residue. Once it becomes a monthly habit, it takes less time than making a cup of tea and waiting for the kettle to cool.

The science made friendly: vinegar and bicarb, no drama

Think of vinegar as the substance that dissolves deposits, and bicarbonate as the deodoriser. As vinegar is mildly acidic, it breaks down the chalky residue that soap readily clings to. Bicarb is mildly alkaline, so it tackles lingering odours and helps rinse away loosened grime. Adding both at once creates an entertaining fizz, but they largely turn into salty water, making them ineffective at cleaning a machine’s hidden areas. Using them consecutively lets each ingredient do its job without the spectacle.

More than a clean drum: tiny rituals that change the whole room

Fresh washing is about more than a pleasant scent. It means gym kit will not emerge with a hint of swamp; a baby’s sleepsuits will not acquire a stale smell overnight; and visitors will not question why the hallway has an odd hum on rainy days. Share the method with housemates or show it to the teenager who has just discovered fabric softener. This two-ingredient approach is memorable because it is inexpensive, fast and forgiving - and it works even on a Tuesday when the sky resembles porridge. Try it once this week and see how the machine smells in three days’ time. Then share your favourite small household hack.

Key point	Detail	Benefit for the reader
Two ingredients	White vinegar (250–400 ml) and bicarbonate of soda (2–3 tbsp)	Inexpensive and likely already in your cupboard
Order matters	Run a hot vinegar cycle, then a short bicarb rinse	Prevents neutralising fizz and gives a deeper clean
Keep it fresh	Leave the door and drawer ajar, wipe the seal quickly and repeat monthly	Stops the smell returning with minimal effort

FAQ:

• Which two household ingredients are we talking about? Plain white vinegar and bicarbonate of soda. No scented vinegars, no baking powder, just the basic stuff.
• Will vinegar damage the rubber seal or hoses? Used occasionally and diluted by a full hot cycle, white vinegar is gentle on modern seals. Don’t soak rubber parts in neat vinegar for hours on end.
• Can I pour vinegar and bicarb in together to save time? You’ll get a satisfying fizz, then a mostly neutral solution that cleans less effectively. Split them into two steps for proper results.
• How often should I do this routine? Monthly suits most homes, fortnightly if you wash constantly or live in a hard-water area. A quick wipe of the seal after each wash makes it last longer.
• What if the smell comes back quickly? Check the drain filter for trapped fluff, coins or hair ties. Run one 60°C load a week, reduce softener, and let the machine dry with the door and drawer open.