What Causes a Washing Machine to Smell? How to Fix It

A smelly washing machine is one of the most common appliance complaints we hear. The frustrating part is that a machine designed to clean things can itself become a source of unpleasant odours. Here's why it happens and exactly what to do about it.

Why Does a Washing Machine Smell?

1. Mould and Mildew in the Door Seal (Front Loaders)

Front loader washing machines have a rubber door gasket (the circular rubber ring around the door opening) that traps moisture, detergent residue and lint after each wash. Without regular cleaning and adequate drying, mould grows in the folds of the gasket — producing that characteristic musty smell.

2. Detergent Residue and Soap Scum Buildup

Using too much detergent, or non-HE detergent in an HE machine, creates a residue that builds up inside the drum, pump and pipes. Over time this residue becomes a breeding ground for bacteria.

3. Standing Water in the Drum

If the door is closed after washing, moisture stays inside with nowhere to go. Combined with warmth, this creates ideal conditions for bacterial growth.

4. Dirty Pump Filter

The pump filter (accessed via a small panel at the front bottom of most front loaders) collects lint, coins, hair and debris from every wash. If left uncleaned for months, it becomes contaminated and smells.

5. Cold Wash Settings Used Exclusively

Washing always at 20–30°C doesn't get hot enough to kill bacteria inside the machine. The drum gradually accumulates a biofilm that contributes to odour.

How to Fix a Smelly Washing Machine

Step 1: Clean the Door Gasket

Open the door and inspect the rubber seal. Pull back the outer lip and clean all the folds with a cloth dampened with a mix of warm water and white vinegar (or diluted bleach for black mould). Dry thoroughly after cleaning.

Step 2: Clean the Detergent Drawer

Remove the detergent drawer completely (it usually pulls out with a press of a release tab). Rinse under warm water and scrub away any residue with a toothbrush. Clean the cavity it sits in too.

Step 3: Run a Hot Service Wash

Run the longest, hottest cycle available (usually a Cotton 90°C cycle) with no laundry inside. Add 500ml of white vinegar or a washing machine cleaner tablet directly into the drum. This breaks down residue and kills bacteria throughout the system.

Step 4: Clean the Pump Filter

Place a towel under the front panel, unscrew the filter (it will drain some water — have a container ready) and rinse it clean under running water. Reinsert and tighten.

Step 5: Establish a Maintenance Routine

• Leave the door open between washes to allow the drum to dry
• Wipe the door seal dry after each wash
• Use the correct amount of HE detergent for your load size
• Run a hot cycle once a month
• Clean the pump filter every 1–3 months

What If the Smell Persists?

If the smell continues after thorough cleaning, the bacteria may be established in the pipes or pump. A second round of service washes with a commercial washing machine cleaner product often resolves this. If not, it may indicate a more serious internal issue — or that the machine is old enough that replacement makes more sense than continued cleaning.

Browse our washing machine range at Oceania Appliances — free delivery across Sydney, 3–6 month warranty on every appliance.

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