Why Does My Washing Machine Smell Bad? (And How to Fix It)

Quick Answer

Musty smells come from detergent residue, fabric fibres, and bacteria trapped in the rubber seal, drum, and pump filter — usually made worse by washing only at low temperatures. Run a 90°C empty cycle with a washing machine cleaner, clean the seal and filter by hand, and leave the door open between washes.

Further reading: Which? — how to clean a smelly washing machine · Which? — how to get rid of mould

Quick Answer: Why Is My Washing Machine Smelly?

If your washing machine smells musty, the most common cause is buildup inside the drum, rubber seal, filter or drain system. Moisture, detergent residue, fabric fibres and bacteria can combine to create unpleasant odours over time.

The good news is that a smelly washing machine is usually easy to fix once you understand what’s causing it.

Why Washing Machines Start to Smell

Washing machines are designed to clean clothes, but they also trap moisture and residue internally. When water doesn’t fully evaporate and debris accumulates, bacteria and mildew can develop.

1. Detergent and Fabric Softener Buildup

Using too much detergent or softener leaves a sticky film inside the drum and internal components. This residue traps dirt and bacteria, creating a musty smell over time.

2. Low Temperature Washes

Many households now wash at 20–30°C to save energy. While this is cost-effective, it doesn’t always kill bacteria or dissolve residue fully. Without occasional hot cycles, odours can develop.

3. Dirty Door Seal

The rubber gasket around front-loading machines is one of the most common sources of washing machine smells musty complaints. Hair, lint and moisture collect inside the folds, creating the perfect environment for mildew.

4. Blocked or Dirty Filter

If your filter is clogged with fibres, hair or debris, stagnant water can sit inside the system. This contributes to a smelly washing machine and may even slow drainage.

5. Hard Water Limescale

In hard water areas UK wide, mineral buildup can trap residue and bacteria inside heating elements and drum interiors. This creates ongoing odour problems if not maintained properly.

How to Remove Washing Machine Odour UK Households Experience

Step 1: Clean the Door Seal

Pull back the rubber seal and inspect inside the folds. Wipe away visible debris with a damp cloth. Pay close attention to trapped lint or hair. Dry thoroughly after cleaning.

Step 2: Check and Clean the Filter

Most front-load machines have a filter access panel near the bottom front. Turn off the machine, place a tray underneath and slowly remove the filter cap. Clear out trapped debris and rinse before reinstalling.

Step 3: Run a Hot Maintenance Cycle

Run an empty hot wash cycle (60–90°C depending on manufacturer guidance). This helps dissolve residue and reduce bacteria buildup inside the drum and internal pipes.

Step 4: Use a Washing Machine Cleaner

A dedicated washing machine cleaner helps break down detergent film, limescale and internal grime more effectively than detergent alone. In hard water areas, monthly maintenance is recommended to prevent recurring odours.

Step 5: Leave the Door Open After Use

After each wash, leave the door slightly ajar. This allows moisture to evaporate and reduces the damp environment that leads to musty smells.

How Often Should You Clean Your Washing Machine?

For most households, running a maintenance clean once per month is sufficient. If you frequently wash at low temperatures, live in a hard water area or wash pet bedding regularly, you may benefit from cleaning every two to three weeks.

Why Hard Water Makes Odours Worse

Hard water leaves mineral deposits inside your machine. These deposits create rough surfaces where detergent and bacteria can cling. Over time, this contributes to persistent smells.

If you live in one of the hard water areas UK homeowners commonly deal with, regular descaling helps prevent both performance issues and odour problems.

Common Mistakes That Make Washing Machines Smell

• Using too much detergent
• Only washing at low temperatures
• Ignoring the door seal
• Never cleaning the filter
• Leaving wet laundry sitting inside the drum

Preventing a Smelly Washing Machine Long-Term

Preventative care is easier than fixing a severe odour problem. A simple routine can keep your machine fresh:

• Wipe the seal weekly
• Clean the filter every few months
• Run a hot empty cycle monthly
• Use a washing machine cleaner regularly
• Keep the door open after each wash

When the Smell Doesn’t Go Away

If you’ve cleaned the seal, filter and run multiple hot cycles but the odour persists, there may be buildup deeper within the drainage system. In rare cases, professional servicing may be required. However, most smelly washing machine issues resolve with consistent maintenance.

Related Reading

• How to Get Rid of Dog Smell from Laundry

FAQs

Why does my washing machine smell musty even after washing?

Odours usually come from internal buildup rather than the drum surface alone. Cleaning the seal, filter and running a hot maintenance cycle often resolves the issue.

Can low temperature washing cause smells?

Yes. Washing consistently at low temperatures allows bacteria and detergent residue to accumulate inside the machine.

How do I remove washing machine odour UK hard water causes?

Use a washing machine cleaner monthly to break down mineral deposits and internal residue, especially if you live in a hard water area.

Is a smelly washing machine harmful?

It’s usually not dangerous, but it indicates bacterial or residue buildup that should be addressed to maintain hygiene and performance.

How can I stop my washing machine smelling again?

Adopt a routine of monthly maintenance cleaning, wipe the door seal regularly and leave the door open after each wash.

Final Thoughts

If your washing machine smells musty, it’s almost always caused by residue, moisture and buildup inside the system. With regular cleaning and preventative maintenance, you can remove washing machine odour UK households commonly experience and keep your appliance running efficiently.