Laundry guide
How to clean a washing machine
A machine that smells is not dirty from dirt. It is detergent residue and body oils that never got hot enough to break down, growing in the one place the water does not reach: the door seal.
Why it happens
Three modern habits cause almost all of it. We wash cold, which saves energy but does not dissolve residue. We use too much detergent, because the cap is bigger than the dose. And we shut the door after unloading, which traps moisture in a warm drum.
Front loaders suffer more than top loaders, because the seal at the door creates a fold that holds water permanently. That fold is where the black specks on your laundry come from.
The clean, step by step
Empty it and check the pockets of the drum
Feel around the seal and under the agitator. Coins, hair clips and tissue collect there and are usually part of the smell.
Clean the rubber gasket first
On a front loader, pull the seal back and wipe the fold with a damp cloth and a little washing-up liquid. This is where black mould grows, and no cycle will reach it.
Pull out the detergent drawer and soak it
Ten minutes in hot water, then a brush. Slime in the drawer means you have been using too much detergent.
Clean the filter
Front loaders have a small hatch at the bottom front. Put a towel and a shallow dish under it, unscrew, let it drain, rinse the filter. Most people have never opened theirs.
Run a hot maintenance cycle
Empty drum, hottest setting, with either two cups of white vinegar or a cup of bleach — never both, and never in the same cycle.
Wipe the door glass and the outside of the seal
While the drum is still warm, so the residue lifts easily.
Leave the door and drawer open
Airing the drum is the single habit that prevents the smell returning.
Never mix bleach and vinegar. Chlorine bleach plus an acid releases chlorine gas. Pick one, run the cycle, and if you want to use the other, do it another month.
The routine that keeps it away
- Leave the door ajar between washes. Free, and the most effective single change.
- Use less detergent. Half the cap is usually right for a normal load in soft water. Suds you can see are suds that will not rinse out.
- Run one hot wash a week. Towels or bedding at 60°C does more than any cleaning cycle.
- Skip the fabric softener, or use it sparingly. It coats the drum, the seal and your towels.
- Take washing out promptly. A wet load left overnight re-seeds everything you just cleaned.
What this means at a laundromat
Commercial machines get the two things home machines lack: genuinely hot cycles and constant use. A busy laundromat washer rarely sits damp long enough to grow a biofilm, which is why laundromat machines are usually cleaner than people fear.
Check anyway. Open the door, pull the seal back, look for grey slime, and smell the drum. If the shop is not keeping its machines clean, that is visible in ten seconds — and a shop that does keep them clean is worth going back to. See how to use a laundromat for the rest of the visit, and how to dose detergent properly for the habit that causes most of this.
Frequently asked questions
Why does my washing machine smell?
Detergent residue, fabric softener and body oils build a biofilm in the drum and the door seal, and cool, damp, sealed conditions let it grow. Low-temperature washing and too much detergent make it worse. The smell is the biofilm, not the water.
Should I use vinegar or bleach to clean a washing machine?
Either works; never both, and never in the same cycle — mixing bleach with acid releases chlorine gas. Vinegar dissolves detergent scale; bleach kills biofilm. Many manufacturers advise against frequent vinegar use on rubber seals, so if you run it monthly, alternate with a proprietary machine cleaner.
How often should I clean my washing machine?
A hot maintenance cycle once a month, the gasket wiped weekly if you wash mostly cold, and the filter checked every few months. Front loaders need it more than top loaders.
Does a hot wash clean the machine?
Partly. Running one genuinely hot wash a week — towels or bedding — keeps the biofilm down far better than any monthly cleaning ritual on a machine that only ever runs cold.
How do I know a laundromat machine is clean?
Open the door and look at the seal fold and the dispenser. Grey slime or a musty smell means the shop is not maintaining them. Commercial machines actually run hotter and more often than home machines, so a well-kept laundromat washer is usually cleaner than the one at home.
Can I clean a washing machine without vinegar or bleach?
Yes. A dedicated washing-machine cleaner tablet in an empty hot cycle does the same job, and soda crystals dissolved in hot water are a cheap alternative for the drawer and drum.