How often should you clean your washing machine?
Updated July 2026
Clean your washing machine once a month: run the tub-clean cycle (or an empty hot cycle) with a washer cleaner, bleach, or oxygen cleaner per your manual. Front-loaders add two habits: wipe the door gasket dry weekly and leave the door ajar between loads, and clear the drain-pump filter every 3–6 months. The machine that cleans everything you own is warm, damp, and coated in detergent residue — exactly what mold and mildew want — and once the smell moves into the gasket, it moves into your laundry.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Front-loader, any household | Tub-clean monthly + gasket wipe weekly | The folded door gasket traps water and lint — it’s where the smell lives |
| Top-loader | Tub-clean monthly | No gasket trap, but residue films the outer tub you can’t see |
| Cold-water washing, liquid detergent, fabric softener | Monthly, without fail | All three leave the most residue for biofilm to feed on |
| HE machine with non-HE detergent or overdosing | Fix the dosing, then monthly | Excess suds leave a residue layer every single load |
| Musty smell already present | Clean now, possibly 2–3 rounds | Established biofilm takes repeat hot cycles to strip |
| Rubber supply hoses 5+ years old | Replace with braided stainless | Not a cleaning item — but the highest-stakes washer check there is |
The cost of skipping it
What skipping it costs: mostly the slow kind — mildew establishes in the gasket and outer tub, every "clean" load comes out smelling musty, and by the time you fight it, a blackened front-loader gasket needs replacement: $150–350 with labor. A never-cleared drain-pump filter (coins, hair ties, lint) eventually stops the machine mid-cycle with a drain error — a $100–200 service call for a 10-minute DIY task. And while you're back there: a burst rubber supply hose floods the laundry room at mains pressure — braided stainless hoses cost $20–30 a pair and are the cheapest flood insurance in the house.
How to do it (10 minutes active, monthly · DIY)
- Monthly: run the machine’s tub-clean/self-clean cycle — or an empty, hottest-setting cycle — with a washer cleaner tablet, a cup of bleach, or oxygen cleaner (check your manual’s preference; never mix cleaners).
- Wipe the door gasket’s folds with a rag (diluted vinegar or a bleach wipe if you see spotting), and pull out anything the folds have collected.
- Pull the detergent drawer and rinse off the residue and mold that accumulate behind it.
- Every 3–6 months: open the small access panel at the front bottom, put down a towel, and unscrew the drain-pump filter — drain the cup or two of water, clear the lint and treasure, screw back.
- Between loads: door ajar, and on front-loaders leave the drawer cracked too — airflow is the cheapest mold prevention there is.
- While you’re behind the machine: check the supply hoses — rubber ones over 5 years old get replaced with braided stainless.
Knowing the interval is the easy half. OnOtto reminds you at the right interval — and won't let you snooze it into next year. Tasks persist until they're done, and completing the monthly tub clean schedules the next one automatically.
Put this on autopilot — free for 30 daysFrequently asked questions
My washer already smells. Will one cleaning cycle fix it?
Usually not — established biofilm takes two or three hot cleaning cycles a few days apart, plus a manual gasket scrub and a drain-filter clear. If the gasket's rubber is deeply blackened (stain, not residue), cleaning won't recover it; that's the $150–350 gasket replacement. The monthly habit exists precisely to keep you off this paragraph.
Bleach, vinegar, or washer-cleaner tablets — which should I use?
Whatever your manual endorses: tablets are formulated for the job and hard to misuse; bleach is the strongest against established mold; oxygen cleaners handle residue well. The one to moderate is vinegar — fine as an occasional rinse, but frequent strong vinegar use can degrade rubber seals over years. Never combine bleach and vinegar (chlorine gas).
Why do front-loaders smell so much more than top-loaders?
Geometry: the door gasket's folds hold a puddle after every load, the door seals airtight, and HE machines use so little water that residue rinses away less. Top-loaders drain better and breathe through the lid. The fix isn't a different machine — it's the weekly gasket wipe, the open door, correct HE detergent dosing, and the monthly hot clean.
What is the drain-pump filter, and do all machines have one?
A lint-and-objects trap protecting the drain pump, behind a small flap at the front bottom corner of most front-loaders (many top-loaders route lint elsewhere). If you've never opened yours, expect a full cup of water and an archaeology layer of coins, hair ties, and socks' final resting place. Clearing it every 3–6 months prevents the mid-cycle drain error that stops laundry on a Sunday night.