Why Does My Washing Machine Smell? Causes and Solutions

A washing machine should leave your laundry smelling clean and fresh — not musty, damp, or unpleasant. If an odour greets you every time you open the door, you’re not alone. Smelly washing machines are a common issue in UK homes, especially in busy households where the machine is used often and maintained only when a problem appears.

The good news is that a bad smell usually has a clear cause, and in many cases, it can be prevented with a few simple habits. In this guide, we’ll explain why your washing machine smells, the most common causes, and the practical steps you can take to keep it fresh.

Why do washing machines start to smell?

Washing machines deal with dirt, detergent, moisture, body oils, fabric fibres, and bacteria every day. Over time, these can build up inside hidden areas of the appliance. Because the inside of a machine is warm and damp, it creates the perfect environment for mildew, mould, and unpleasant odours to develop.

Front-loading machines are especially prone to this because of the rubber door seal and the way water can sit inside the drum and detergent drawer after a cycle.

Common causes of a smelly washing machine

1. Detergent and fabric conditioner build-up

Using too much detergent does not make clothes cleaner. In fact, excess detergent can leave a sticky residue inside the drum, pipes, and drawer. Fabric conditioner can do the same. This residue traps dirt and bacteria, eventually causing a sour or stagnant smell.

If you regularly wash at lower temperatures, the build-up can be even worse because cooler cycles don’t break down residue as effectively.

What to do:

• Use the recommended amount of detergent for your load size and water hardness
• Avoid overusing fabric conditioner
• Run a hot maintenance wash occasionally to help clear residue

2. A dirty rubber door seal

The rubber seal around the door is one of the most common places for odours to develop. Water, lint, hair, soap scum, and even small items like coins or hair grips can get trapped there. This area stays damp long after a cycle has finished, which makes it ideal for mould and mildew.

Signs to look for:

• Black spots on the rubber seal
• Slimy residue
• A strong musty smell when you open the door

What to do:

• Pull back the seal carefully and wipe around it with a cloth
• Remove any trapped debris
• Dry the seal after each wash if possible

3. A clogged detergent drawer

Detergent drawers can become coated in soap residue, mould, and stagnant water. Because this area is out of sight, it’s easy to forget about it.

What to do:

• Remove the drawer if your model allows it
• Wash it in warm soapy water
• Scrub away any residue with an old toothbrush
• Wipe the drawer compartment inside the machine too

4. A blocked or dirty filter

Your washing machine’s filter catches fluff, lint, and small objects from laundry. If it becomes blocked, trapped debris can begin to smell and may also affect drainage.

A dirty filter can lead to standing water inside the machine, which often causes that unpleasant damp odour.

What to do:

• Check your manufacturer’s guide for the filter location
• Place a towel or shallow tray underneath before opening it
• Remove debris and rinse the filter thoroughly

If you’re unsure, it’s best not to force anything.

5. Water left sitting in the machine

If water isn’t draining properly, or if you leave wet laundry in the machine for too long, smells can quickly develop. Even a small amount of stagnant water can create a stale odour.

What to do:

• Remove washing promptly after the cycle ends
• Check for drainage issues if water seems to be collecting
• Leave the door and detergent drawer slightly open between washes to help the machine dry out

6. Too many low-temperature washes

Eco cycles and cooler washes are great for energy efficiency, but they can contribute to odours if used all the time. Lower temperatures don’t always dissolve grease, detergent, and bacteria fully, so build-up is more likely over time.

What to do:

• Run an empty hot wash from time to time
• Use a washing machine cleaner if suitable for your appliance
• Balance eco washes with occasional hotter cycles

How to get rid of washing machine smells

If your washing machine already smells, try these simple steps:

Give it a full clean

Clean the parts most likely to hold grime:

• Rubber door seal
• Detergent drawer
• Filter
• Drum door glass

Use a soft cloth and warm soapy water. Avoid harsh scrubbing tools that may damage seals or surfaces.

Run a hot empty cycle

A maintenance wash can help loosen residue and flush out odour-causing bacteria. You can use a specialist washing machine cleaner designed for this purpose, following the product instructions carefully.

Improve ventilation

One of the easiest ways to prevent smells is to let the inside dry properly. Leaving the door and detergent drawer ajar after a wash allows air to circulate and reduces trapped moisture.

Check your detergent habits

If you’ve been using more detergent than needed, cut back. This small change can make a big difference over time.

Practical tips to keep your washing machine fresh

Here are a few simple habits that help prevent smells from returning:

• Wipe the rubber seal weekly
• Clean the detergent drawer regularly
• Empty pockets before washing clothes
• Don’t overload the drum
• Leave the door open after use
• Run a maintenance wash every so often
• Clean the filter as recommended by the manufacturer
• Remove clean washing promptly

Regular care doesn’t take long, but it can help your machine stay fresher, perform better, and potentially last longer.

When to book a professional washing machine clean

Sometimes, a smell lingers even after you’ve cleaned the obvious areas. That’s often a sign that grime, detergent residue, limescale, and bacteria have built up deeper within the machine — in places that are difficult to access yourself.

A professional washing machine clean can help tackle stubborn odours, remove hidden build-up, and restore freshness to your appliance. It’s also a good option if:

• The smell keeps returning
• You’ve noticed black mould around seals
• Your laundry doesn’t smell fresh after washing
• The machine hasn’t been professionally cleaned in a long time
• You want to maintain your appliance as part of regular home care

At Fordwell Oven & Appliance Care, we provide professional appliance cleaning for homeowners across Kent, Surrey, East Sussex, Essex, and West Sussex. Our service is designed to help bring appliances back to a cleaner, fresher condition with less hassle for you.

Final thoughts

If you’ve been wondering, “Why does my washing machine smell?”, the answer is usually down to residue, trapped moisture, or hidden grime. The good news is that with regular maintenance and a few simple changes, many odours can be prevented.

If your machine still smells despite your best efforts, a deeper professional clean may be the most effective solution.

If you’re based in Kent, Surrey, East Sussex, Essex, or West Sussex, book a professional washing machine clean with Fordwell Oven & Appliance Care to help keep your appliance fresh, hygienic, and working at its best.