How to Clean a Washing Machine That Smells: The Monthly Routine Your Brand Actually Recommends
Does your "clean" laundry come out smelling like a damp basement?
The smell is not your laundry. It is biofilm — mold and detergent residue growing inside the machine — and the fix is a cleaning cycle your washer already has, run once a month.
Most guides hand you one generic recipe: two cups of vinegar, a hot cycle, done. The problem is that the four biggest washer brands do not agree on that recipe. They name different cycles, different cleaners, and different amounts — and some of the most-shared advice online contradicts the manuals by a factor of sixteen. This post follows what Samsung, LG, Whirlpool, and GE actually print in their own care guides, plus the one habit that keeps the smell from coming back.
Why Your Washing Machine Smells
A smelly washer is a fed washer: moisture plus leftover detergent grows the biofilm that makes the smell.
Front-loaders get the worst of it. The rubber door seal holds water in its folds after every load — dark, damp, and coated in detergent residue. That is mold's ideal home, and the cleaning cycle's water never reaches deep into those folds.
The other half of the problem is the detergent itself. Modern HE detergent is concentrated: Consumer Reports puts a normal HE load at about 1.5 fluid ounces, roughly 2 tablespoons. Fill the cap to the top line and you may be pouring three to five times that. The excess never fully rinses out, and Whirlpool's own guidance says leftover detergent leaves a residue that traps odor-causing bacteria — in fabric, and on every surface inside the machine.
Three more spots feed the smell where the cycle cannot reach: the detergent drawer, the drain pump filter, and — on top-loaders — under the agitator cap and around the tub rim. Cleaning the drum alone leaves all of them untouched.
That is also why the smell comes back. Clean once, then go back to overdosing detergent, and the biofilm is fed again within weeks.
What Your Brand Actually Tells You to Do
Every major brand wants a monthly cleaning cycle — but the cycle name, the cleaner, and the amount are different. Find your brand, then follow its row.
If your machine already smells musty, LG and GE both say to run the cleaning cycle once a week for three weeks in a row. Whirlpool's guidance for heavy residue and odor is three consecutive cleaning cycles. And if your model has a reminder light, take it seriously: Samsung flashes it after 20 washes on top-loaders and 40 on front-loaders, LG after 30, Whirlpool after 30. In a household that does laundry daily, that count arrives in three to five weeks — which is why monthly is the practical baseline.
One more reason to trust the manual over the search results: the bleach amounts in popular guides range from a quarter cup to four cups for the same job. A sixteen-fold spread is not a rounding error. It is a sign that the guide never read a manual.
The Deep Clean, Step by Step
Plan on about 30 minutes of hands-on work plus one cleaning cycle. Work in this order — the cycle cannot clean what it cannot reach.
1. Empty the machine
Take out all laundry. Never run a cleaning cycle with clothes inside — Samsung warns it can damage both the washer and the clothes.
2. Scrub the gasket and the drawer
Pull the rubber seal back all the way around — not just along the bottom, where the grime is visible. The top folds collect just as much. Wipe the folds with a cloth dipped in diluted bleach — LG's recipe is 3/4 cup of liquid chlorine bleach in 1 gallon of warm water — or vinegar in its place. Never both, and never undiluted bleach on the rubber: LG warns straight bleach can break the seal down over time.
Push a toothbrush through the small drain holes at the bottom of the fold until water drains freely. A clogged hole is why the fold stays wet — and why the smell keeps coming back after a cleaning cycle.
Pull the detergent drawer out and soak it in hot, soapy water for 15 minutes, then scrub the cavity behind it. LG's own schedule says to clean the dispensers weekly.
3. Empty the drain pump filter
Turn the machine off and unplug it first. The filter sits behind a small panel at the bottom front of the machine. Put a towel and a shallow pan underneath, drain the hose first if there is one, then twist the filter counterclockwise and pull it out. Rinse it under hot tap water and wipe out the housing before screwing it back in.
Wait an hour after a hot cycle before opening the filter, so the water left inside can cool — Samsung's own caution. Whirlpool and LG both put this job on a monthly schedule.
4. Run the cleaning cycle — empty
Drop the tablet in the bottom of the drum, never in the dispenser, or add the cleaner your brand names from the table above. Select the cleaning cycle and press start. No clothes, no detergent. Budget the time: about an hour on a Samsung top-loader, up to four hours on a Samsung front-loader, about 90 minutes on a GE Basket Clean.
5. Dry it out
When the cycle ends, wipe the drum and the gasket dry and leave the door — and the drawer — open so air can move through. Mold cannot grow on a dry surface, and this ten-second habit is what keeps the clean from fading in a week.
Top-loaders have their own hidden spots: wipe the tub rim and the lid, and if your agitator cap comes off, scrub under it with a brush. The cleaning cycle and the monthly schedule are the same.
What the Smell Is Telling You
Not every washer smell comes from the washer. Match the smell before you clean.
- Musty, like a damp towel: Mold and biofilm in the gasket, drawer, or drum. The deep clean above is the fix.
- Rotten egg or swampy: Rotting lint and debris in the drain pump filter. Step 3 is the fix — the smell usually clears once the filter is out.
- Sewage, like a drain: The machine is probably innocent. A dried-out P-trap in the drain standpipe lets sewer gas in. Pour a gallon of water down the standpipe, and down any nearby floor drain, to rebuild the water seal. If the smell returns, call a plumber — no amount of cleaning the drum will fix a plumbing problem.
- Burning or electrical: Stop the load, unplug the machine, and call a technician. Do not run a cleaning cycle.
- Gas: A gas smell almost never comes from the washer. Leave the area and call your gas company or emergency services.
The Two-Tablespoon Rule: Stop Feeding the Smell
The cheapest fix costs nothing: use less detergent.
For a normal load in a modern HE washer, about 2 tablespoons of liquid detergent is enough — Consumer Reports' figure is about 1.5 fluid ounces. With soft water, 1 tablespoon often does it; with hard water, go to 2; for a large or heavily soiled load, 3 tablespoons is the ceiling.
Extra soap does not mean extra clean. The suds cushion clothes so they rub against each other less, rinse worse, and leave the sticky film that biofilm eats. If a load is truly dirty, add time or heat — not more soap.
The same overdosing mistake wears your clothes out faster, too: excess detergent stiffens fabric and traps odor in it. The full list is in our laundry mistakes guide.
Keep It From Coming Back: The Monthly Routine
A smelly washer is a maintenance problem, not a one-time cleaning problem. Put three jobs on a schedule.
- After every load: Wipe the gasket dry and leave the door and the detergent drawer open. Ten seconds, and it removes the water mold needs to grow.
- Monthly, or every 30 loads: Cleaning cycle with your brand's cleaner, plus the drain pump filter and a gasket wipe. Set a phone reminder for the first Saturday of the month.
- When the reminder light comes on: Do not snooze it. The light means the machine has counted 20 to 40 loads since the last clean — the biofilm is already back.
Key Takeaway
The smell is biofilm, and biofilm is fed by water and excess detergent. Run your brand's cleaning cycle once a month, scrub the three spots the cycle cannot reach — the gasket, the drawer, and the filter — and measure your detergent at two tablespoons instead of filling the cap.
Clean the machine monthly, dose the detergent by the tablespoon, and leave the door open — the smell has nowhere left to grow.
Sources
- LG USA Support — How can I maintain the washing machine?
- Samsung Support — How to Use the Self-Clean Feature on Your Samsung Top Load Washer
- Whirlpool Product Help — Removing Odors and Smells — All-In-One Washer Dryer
- affresh — Washing Machine Cleaner directions
- GE Use and Care Manual — Care and Cleaning (Basket Clean)
- Consumer Reports detergent dosing, via Trendir — Extra detergent isn't making your clothes cleaner
- Oh So Spotless — Washing Machine Smells? 5 Odors and What They Mean
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