The drain filter: the smelly part nobody ever opens
Every front-loader has a trap between the drum and the drain pump whose job is to catch things that would wreck the pump: coins, buttons, hair clips, the occasional baby sock. It sits behind a small hatch low on the front of the machine, usually in one corner. Along with the debris it catches, it holds a pocket of water that never fully drains — and stagnant water plus trapped lint, sitting warm behind a plastic door for months, is exactly the kind of thing that makes a whole machine smell.
If your washer smells and you’ve never opened this hatch, open it. It’s the highest-value fifteen minutes in washer maintenance.
Before you start
- Unplug the machine. You’ll have fingers in a cavity near the pump; don’t rely on the machine simply being off.
- Expect real water. Somewhere between a cup and a litre and a half, depending on the machine — even if the last cycle drained normally. Lay a towel flat under the hatch and have a shallow tray (a baking dish works) plus a second towel ready.
- Expect it to be unpleasant. The water may be grey and the smell concentrated. Gloves are a good idea. This is normal, not a sign your machine is broken.
Opening and cleaning it
- Open the hatch — it usually unclips with a fingernail or flat screwdriver.
- Use the emergency drain hose first if there is one. Many machines have a small black hose coiled next to the filter cap. Unplug its stopper over your tray and let it run; refill the tray as needed until it stops.
- Turn the filter cap slowly counter-clockwise and pull it out. Water will follow it out even after the drain hose — go slowly and let the tray catch it.
- Pull the lint, hair, and objects out of the filter and the cavity. Check the cavity with a torch; debris sometimes sits in the impeller housing behind it. If you can see the pump impeller, it should turn freely with a finger.
- Rinse the filter under a warm tap and brush the mesh clean.
- Screw it back in hand-tight, close the hatch, and run a short cycle, watching for drips the first time.
How often?
Honest answer: the advice varies, because it genuinely depends on your household. Sources put it anywhere from every couple of months to twice a year. A reasonable rule: every three months for a typical household, and closer to every two months if you have pets, small children, or a machine that runs daily — pet hair and lint are what fill it. If what comes out is foul, you’ve found your cadence is too long; if it’s nearly clean, stretch it.
Slow draining, a machine that stops mid-cycle with a drain error, or clothes coming out wetter than usual are all signs the filter is due regardless of the calendar.
Top-loader owners: you probably don’t have one
Most top-loaders route drain water through the bottom of the tub in a way that doesn’t accumulate debris the same way, so manufacturers don’t fit an accessible trap. Some hide a lint screen in the agitator column or along the drum rim — the manual will say. If your smelly machine is a top-loader, the more likely culprits are detergent residue and the drum itself: start with why the smell keeps coming back and the cleaner comparison.
Once the filter’s clean, pair it with a gasket clean and a hot empty cycle — the three together cover almost everywhere a front-loader hides smell.