Mould in a Washing Machine: Causes, Risks, and Solutions

Finding mould in a washing machine is a frustrating experience for many homeowners. The very appliance that is supposed to clean your clothes can become a breeding ground for unpleasant odours, black marks, and even health risks. Left untreated, a mouldy washing machine can affect your laundry, shorten the lifespan of your appliance, and create poor air quality in your home.

This article explains what causes mould in washing machines, the risks it presents, and the steps you can take to clean and prevent it.

Why Does Mould Grow in Washing Machines?

Mould thrives in damp, warm environments. Washing machines—especially modern energy-efficient models—provide the perfect conditions. Using low-temperature washes, excess detergent, and failing to ventilate the machine after use are all common contributors.

Front-loading washing machines are particularly prone to mould because the rubber door seal often traps water and detergent residue. Over time, this creates the ideal surface for mould spores to grow.

Read also: why does mould grow on walls

Signs of a Mouldy Washing Machine

If you are unsure whether your machine has a mould problem, look for these tell-tale signs:

• A persistent musty or unpleasant smell coming from the drum. 
• Black or green spots on the rubber door seal. 
• Clothes that come out smelling less than fresh even after a wash. 

Ignoring these early warnings can make the problem worse, leading to a full build-up of mould that is much harder to remove.

Health Risks of Washing Machine Mould

Mould does not just affect your clothes; it can also impact your health. According to the NHS, mould exposure can worsen allergies, trigger asthma, and cause respiratory irritation (NHS). This is particularly concerning for children, older adults, or anyone with existing breathing conditions.

Having mould in your washing machine means spores are present in the laundry environment, which may spread into the air or onto clothing.

Read more: Health Risks of Mould Exposure

How to Clean Mould from a Washing Machine

If you notice mould in a washing machine, tackling it quickly is the best approach. Here are effective methods to restore your appliance:

1. Clean the Rubber Seal

    

   • Mix equal parts white vinegar and water. 
   • Use a cloth or old toothbrush to scrub the mould from the seal. 
   • Wipe thoroughly and leave the door open to dry. 

2. Run a Hot Cleaning Cycle

    

   • Many machines have a cleaning or maintenance cycle. If not, run an empty wash at 90°C with a cup of white vinegar or baking soda. 
   • This helps kill spores and remove residue from inside the drum. 

3. Clean the Detergent Drawer

    

   • Remove the drawer and soak it in hot, soapy water. 
   • Scrub away any visible mould and rinse before replacing it. 

4. Dry and Ventilate

    

   • Always leave the door and detergent drawer open after use to allow airflow. 
   • This prevents moisture build-up, which mould needs to grow. 

Preventing a Mouldy Washing Machine

Once you have cleaned your washing machine, it is important to prevent mould from returning. Some effective habits include:

• Running a hot wash once a month to kill hidden spores. 
• Using the right amount of detergent—too much can leave residue that encourages mould. 
• Regularly wiping the rubber seal and drum after washing. 
• Keeping the machine door and drawer open when not in use. 

These small steps can make a big difference in keeping your washing machine fresh and mould-free.

Read more: Can black mould make you sick

Conclusion

Discovering mould in a washing machine is unpleasant, but it is not the end of your appliance. With proper cleaning and preventative care, you can restore freshness and protect both your laundry and health. A mouldy washing machine does not just affect your clothes; it can affect your home’s air quality too. By taking action early, you save yourself from bigger problems later.

Frequently Asked Questions

1. Why does my washing machine smell mouldy?
   This usually happens because water and detergent residue are trapped in the machine, creating a damp environment where mould thrives.
2. Can mould from a washing machine make you sick?
   Yes. Mould spores can cause respiratory irritation, particularly for people with asthma or allergies.
3. How often should I clean my washing machine to prevent mould?
   Experts recommend running a hot cleaning cycle once a month and wiping down the seals after each use.