How to Clean Your Washing Machine Drum and Prevent Mould
A washing machine that smells musty or leaves clothes with an unpleasant odour is a sign the drum, door seal and dispenser need cleaning. Mould and bacteria build up over time, particularly in front-load washing machines where water can pool in the door seal and drum. This guide walks through how to clean your machine thoroughly and how to prevent the problem recurring.
Why Does a Washing Machine Get Mould?
Three conditions create the perfect environment for mould and bacteria in a washing machine: moisture, warmth and nutrients (detergent residue and fabric fibres). Front loaders are more susceptible than top loaders because the door seal creates a fold where water and residue accumulate, and the door is typically kept closed between uses. Using too much detergent, using non-HE detergent in an HE machine, and washing exclusively on cold also contribute to build-up.
What You Need
- White vinegar (1–2 cups)
- Bicarbonate of soda (baking soda)
- Microfibre cloths or old towels
- An old toothbrush or small brush
- Mild detergent or washing machine cleaner tablets (optional)
Step 1: Clean the Door Seal (Front Loaders)
Pull back the rubber door seal and inspect inside the fold. Wipe out any visible mould, water and debris with a damp cloth. For stubborn mould, mix equal parts white vinegar and water in a spray bottle, spray the seal, leave for 10 minutes, then scrub with a toothbrush. Wipe clean with a dry cloth. This step alone dramatically reduces musty odours in most front loaders.
Step 2: Clean the Detergent Drawer
Remove the detergent drawer completely (there is usually a release tab). Rinse it under warm running water, scrubbing all compartments with a brush to remove detergent residue and any mould. Wipe down the drawer cavity in the machine with a damp cloth. Allow the drawer to dry before reinserting.
Step 3: Run a Drum Clean Cycle
Most modern washing machines have a dedicated drum clean or tub clean cycle — run it monthly. If yours doesn't have one, run a hot wash (60°C or higher) on the highest water level with the drum empty. Add one of the following to the drum or dispenser: 2 cups of white vinegar, or a commercial washing machine cleaning tablet. This kills bacteria and removes residue from the drum walls, hoses and pump.
Step 4: Run a Rinse Cycle
After the drum clean cycle, run a short rinse-and-spin cycle to flush out any remaining cleaner residue. Leave the door and detergent drawer open to allow the drum to air dry completely.
Preventing Mould Build-Up
- Leave the door and detergent drawer open after every wash to allow air circulation and drying
- Remove wet clothes promptly after the cycle ends
- Use only the recommended amount of HE detergent
- Run a hot wash at least once a fortnight
- Wipe the door seal dry after each use if mould recurrence is a problem
- Run a drum clean cycle monthly
Persistent Mould Problems
If mould returns quickly after cleaning, the door seal may have developed small tears or crevices that harbour mould permanently. A technician can inspect and replace the seal if necessary. Persistent musty odours after cleaning can also indicate a blocked drain filter or pump residue — check and clean the drain filter, which is usually accessible behind a small panel at the base of the machine.
Need a New Washing Machine?
If your machine is old and mould is a persistent problem, upgrading to a modern machine with better door seal design and regular drum clean programs may be the best long-term solution. Oceania Appliances stocks washing machines from Bosch, Electrolux, Samsung, LG, Fisher & Paykel and more. Free delivery across Sydney. Visit 2/14 Centre Place, Wetherill Park, call or WhatsApp 0422 489 492, or email support@oceaniaappliances.com.au.