A washing machine that smells bad is a problem Brisbane households know all too well — especially during the humid summer months. That musty, mouldy, or sewage-like smell coming from your washer is not just unpleasant; it transfers onto your clothes and can indicate mould growth, drainage issues, or bacterial buildup inside the machine that needs to be addressed.
Why Your Washing Machine Smells
Washing machines create an ideal environment for mould and bacteria — they are dark, frequently moist, and contain traces of detergent, fabric softener, and body soil after every wash. Brisbane’s subtropical humidity makes this worse because the machine’s interior takes longer to dry out between uses, giving mould and bacteria more time to establish colonies.
Mouldy or Musty Smell
The most common washing machine odour is a damp, musty smell caused by mould and mildew growth. In front-loaders, the primary culprit is the rubber door seal (gasket) — water, lint, and detergent residue collect in the folds of the seal and create a perfect breeding ground for black mould. You can often see visible mould spots when you pull back the seal folds.
Mould also grows inside the outer tub (the part you cannot see), on the back of the drum, inside the detergent dispenser drawer, and in the drain hose. Front-loaders are far more prone to this than top-loaders because their horizontal drum design means the door seal sits in a water-collecting well.
Rotten Egg or Sewage Smell
A sulphur or sewage smell usually indicates bacterial buildup in the drain system. Bacteria thrive in the warm, stagnant water that sits in the drain pump, sump hose, and drain hose between washes. This is especially common if you primarily wash in cold water — without regular hot washes, bacteria are never killed off and their colonies grow.
A sewage smell can also come from a faulty or missing drain trap in your plumbing. If the drain hose connects directly to a waste pipe without an appropriate trap or air gap, sewer gas can travel up the hose and into the machine. This is a plumbing issue rather than a machine fault, but we see it regularly in older Brisbane homes and DIY laundry installations.
Chemical or Burning Smell
A chemical smell is less common but can occur when excess detergent builds up inside the machine and begins to decompose. It can also indicate a motor or belt issue — though these typically produce a distinct burning rubber or hot electrical smell rather than a chemical odour. If you smell burning, stop the machine immediately and book a repair.
How to Clean a Smelly Washing Machine
Clean the Door Seal (Front-Loaders)
Pull back the folds of the rubber door gasket and wipe out any accumulated gunk, hair, and mould with a cloth dampened with white vinegar or a diluted bleach solution (1 tablespoon of bleach per litre of water). Pay particular attention to the bottom of the seal where water pools. This should be done weekly in Brisbane’s climate.
Run a Hot Maintenance Wash
Run an empty cycle on the hottest temperature setting (90°C if available) with either two cups of white vinegar or a washing machine cleaning tablet. Do not use both vinegar and bleach together. This kills bacteria and mould throughout the drum, tub, and hose system. Run this monthly — or fortnightly during summer in Brisbane.
Clean the Detergent Dispenser
Remove the detergent drawer completely (most pull out with a release tab). Wash it in warm soapy water, scrubbing the compartments with an old toothbrush. Also clean inside the dispenser housing — mould grows aggressively in the damp cavity where the drawer sits.
Clean the Drain Filter
Front-loaders have a coin trap filter at the bottom front. Open the access panel, place towels down, slowly unscrew the filter, drain the residual water, and clean the filter and housing. Stagnant water in the filter housing is a major source of bad smells.
Leave the Door Open
After every wash, leave the door ajar (front-loaders) or lid open (top-loaders) to let the interior dry out. In Brisbane’s humidity, this single habit makes the biggest difference to preventing odours. Also leave the detergent dispenser drawer slightly open.
Use the Right Amount of Detergent
Excess detergent does not get fully rinsed away — it accumulates inside the machine as a slimy residue that breeds bacteria. Front-loaders especially need very little detergent. Use an HE (high-efficiency) formulation and measure according to the product instructions rather than eyeballing it. Most people use two to three times more detergent than they need.
When the Smell Will Not Go Away
If you have tried all the cleaning steps above and the smell persists, the problem is likely one of these:
Mould behind the drum: Mould colonies on the back of the inner drum and inside the outer tub cannot be reached without disassembling the machine. A professional can remove the drum and clean or treat these surfaces, or recommend replacement if the mould damage is severe.
Contaminated door seal: Once mould has penetrated deep into the rubber gasket material, surface cleaning will not eliminate the odour. The seal needs to be replaced — we carry door seals for most major brands.
Blocked or contaminated drain hose: Biofilm buildup inside the drain hose cannot be cleaned effectively from the outside. Replacing the drain hose is often the most practical solution.
Plumbing issue: If the smell is specifically a sewage odour, have a plumber check your drain trap and waste pipe configuration.
Professional Washing Machine Cleaning and Repair
At Always Prompt Repairs, we handle washing machine odour problems across all major brands including Samsung, LG, Bosch, Miele, and Fisher & Paykel. Whether the fix is a door seal replacement, drain hose swap, or a deep clean of the drum and tub, we can sort it in a single visit.
Our callout fee is $219 (includes the first 30 minutes of labour), with additional time at $45 per 15-minute block. $20 discount for seniors, pensioners, and students. All prices are estimates only and parts are additional.
Book Your Washing Machine Repair
Sick of smelly clothes from a smelly washer? Book your repair online and we will get it sorted — usually within 24-48 hours across Greater Brisbane, Ipswich, and the Northern Gold Coast.
Or call (07) 3062 2377 to book by phone.