Why Your Washing Machine Smells and What to Do

A clean load of washing should not come out smelling damp, sour or musty. If your washing machine smells, the cause is often trapped detergent residue and moisture, but it can also point to a drainage or plumbing fault that needs attention. The sooner you deal with it, the easier it usually is to get the machine and your laundry smelling fresh again.

Why washing machine smells develop

Modern machines use less water than older models and many people wash at 30°C or 40°C most of the time. That saves energy, but it can leave behind detergent, fabric conditioner, body oils and bacteria inside the drum, drawer and pipework. When the machine is shut between washes, the damp conditions allow that build-up to create an unpleasant smell.

A slight stale odour is common and is normally manageable with a thorough clean. A strong sewage smell, a burning smell, or water left in the drum is different. Those signs can indicate a blocked filter, drainage problem, fault with the pump or an issue with the waste pipe connection.

The smell itself can give you a useful clue. A musty or damp smell usually comes from residue around the door seal or detergent drawer. An egg-like or drain smell may come from the filter, drain hose or household plumbing. A hot, electrical smell should not be ignored - switch the appliance off at the mains and arrange for it to be checked.

Start with the simple cleaning jobs

Before assuming the machine has failed, clean the areas where dirt and moisture collect. Always switch the washing machine off and unplug it before removing parts or opening the filter.

Clean the door seal properly

Pull back the folds of the rubber seal around the door. It is common to find hair, lint, tissues, coins, mould or even a small sock trapped there. Wipe it with a cloth and warm, soapy water, then dry it thoroughly. If there is mould, use a suitable cleaner according to its instructions and avoid mixing cleaning products.

Check the seal carefully for tears or loose sections. A damaged seal may leak as well as hold dirty water. It is a repairable part on many machines, but the correct seal needs to be fitted properly to prevent further leaks.

Wash the detergent drawer

Take out the detergent drawer if your model allows it. Soak it in warm water, scrub away any gel-like conditioner or powder residue, and clean the drawer housing as far as you can reach. The small water jets above the drawer can become clogged too, stopping detergent from rinsing through properly.

Using more detergent than the packet recommends does not make washing cleaner. It often leaves a film inside the machine. This is especially likely with liquid detergent and fabric conditioner, which can build up over time.

Clean the pump filter

The filter is usually behind a flap at the lower front of the washing machine. Place towels and a shallow tray underneath before opening it, as water is likely to come out. Some machines have a small emergency drain hose beside the filter, which makes this job less messy.

Remove lint, buttons, hair grips and any other debris, then check that the filter cap screws back in securely. If the filter is badly blocked, the machine may struggle to drain and stale water can sit inside the system. Never force the filter if it will not turn - it may be jammed or damaged.

Run a maintenance wash

Once the drawer, seal and filter are clean, run an empty maintenance wash at 60°C or hotter if the manufacturer permits it. Use a washing machine cleaner or a small amount of suitable cleaner as directed on the product. Do not put clothes in for this cycle.

A hotter wash helps break down the residue that lower-temperature cycles leave behind. If the smell has been there for a while, repeating this after a week can help, but do not keep adding cleaners in the hope of solving a fault.

Check the drain hose and waste connection

If the washing machine smells of drains, look at the drain hose behind the appliance. It should not be pushed too far down the standpipe, trapped behind the machine or bent sharply. A kink can stop wastewater leaving properly, while an incorrect hose position can allow drain odours to travel back towards the machine.

The problem is not always the washing machine. A blocked sink waste, standpipe or external drain can cause sewer smells in the utility room or kitchen. If you notice the smell around the sink as well as the washer, or hear gurgling when the machine drains, the household waste pipe may need investigating.

A machine that leaves water in the drum, stops part way through a programme or displays a drainage error may have a blocked pump, damaged hose or failing drain pump. These faults need a proper diagnosis rather than repeated cleaning cycles.

Habits that keep the smell from returning

After each wash, leave the door and detergent drawer slightly open for a few hours. This allows the drum and drawer housing to dry out instead of holding moisture overnight. It is a small habit that makes a real difference, particularly in busy family homes where the machine is used most days.

Use the right amount of detergent for the load size, water hardness and level of soiling. Too much detergent is one of the main reasons machines develop residue. Avoid pouring fabric conditioner directly into the drum unless the product specifically says it is safe to do so.

It also helps to run an occasional hotter wash. Bedding, towels and cleaning cloths often suit a 60°C cycle if their care labels allow it. This gives the machine a regular internal clean without wasting a cycle solely for that purpose.

If you use washing machine cleaning tablets or liquids, use them as directed rather than every week. More cleaner is not necessarily better, and some products can be harsh if overused.

When a bad smell means you need a repair

Cleaning will not fix every cause of washing machine smells. It is worth arranging a repair if the odour returns immediately after cleaning, water is not draining away, the machine is leaking, or there is a loud noise during draining. A smell of burning rubber, hot plastic or electrics is a reason to stop using the appliance until it has been checked.

A worn pump can leave dirty water behind. A split hose can leak into places you cannot see. In some cases, a fault in the heating system means the machine never reaches the temperature needed to wash away residue. These are all jobs where an experienced engineer can identify the cause without replacing parts unnecessarily.

For households in Derby and the surrounding area, Derbyshire Appliances can assess washing machine faults directly, with free estimates and no call out charge. With more than 25 years of hands-on experience across major brands, the aim is always to give a clear answer on whether a repair is economical before work starts.

A washing machine should make everyday life easier, not leave your clothes needing another wash. Clean the seal, drawer and filter first, give the machine a hot maintenance cycle, and pay attention to any drainage or electrical warning signs. Acting early usually keeps a simple smell from becoming a bigger repair job.