How to Remove Mould from Window Frames

A Step-by-Step Guide for UK Homeowners

Mould and mildew are common issues in homes across the UK, especially in areas with high humidity or damp conditions.

One of the places where mould can develop is around your window frames, which can be both unsightly and potentially harmful to your health.

In this detailed guide, we'll walk you through how to remove mould from window frames and prevent it from coming back.

Why Does Mould Grow on Window Frames?

Mold thrives in damp, humid environments. In the UK, our often rainy climate and condensation in homes can create the perfect conditions for mould to grow, particularly on window frames made from wood, uPVC, and even aluminium. Mould on window frames is usually a sign of excess moisture or poor ventilation.

Tools and Materials You Will Need

Before you start, gather all the necessary tools and cleaning supplies:

• Rubber gloves

• Protective mask

• Safety goggles

• Soft-bristle brush or toothbrush

• Spray bottle

• Warm water

• Mild detergent (such as washing-up liquid)

• White vinegar or hydrogen peroxide

• Baking soda (optional)

• Household bleach (optional)

• Microfiber cloths or paper towels

• Plastic sheet or old towel to protect surfaces

  
  

Step 1: Prepare the Area

Before tackling the mould, take precautions to protect yourself and your surroundings.

1. Wear protective gear – Mould can release spores into the air, which may cause respiratory issues. Wear rubber gloves, a face mask, and goggles to protect your skin, eyes, and lungs.

2. Ventilate the room – Open windows or turn on fans to ensure proper ventilation. This will help remove airborne mould spores from the room.

3. Cover nearby surfaces – Place a plastic sheet or towel under the window to protect the sill and flooring from drips and spills while you clean.

   
   

Step 2: Dry the Area

If there is moisture on or around the window frame, you need to dry it first. Use a cloth or paper towels to wipe away condensation. Mould loves damp areas, so making the surface dry is essential to prevent the spread of spores while cleaning.

Step 3: Apply a Cleaning Solution

You have several options when it comes to cleaning solutions, depending on the severity of the mould growth. Below are the top methods you can try:

Method 1: White Vinegar Solution (Best for Mild Mould)

White vinegar is a natural mould killer, and its acidity helps break down mould without harmful chemicals.

1. Fill a spray bottle with undiluted white vinegar.

2. Spray the vinegar generously onto the mouldy areas of the window frame.

3. Let it sit for about 1 hour to allow the vinegar to penetrate the mould.

   
   

Method 2: Hydrogen Peroxide (For Stubborn Mould)

Hydrogen peroxide is another effective, non-toxic mould cleaner that works well for heavier mould growth.

1. Mix 1 part 3% hydrogen peroxide with 2 parts water in a spray bottle.

2. Spray the solution onto the mouldy window frame and leave it to sit for 10–15 minutes.

   
   

Method 3: Bleach Solution (For Severe Mold)

If the mold is more severe, bleach can be a powerful disinfectant. However, be cautious using bleach on wood or coloured window frames as it may discolour the surface.

1. Mix 1 part bleach with 10 parts water.

2. Apply the solution with a spray bottle or a sponge.

3. Allow it to sit for 10–15 minutes.

   
   

Step 4: Scrub the Mould Away

After letting the cleaning solution soak in, it's time to remove the mould.

1. Use a soft-bristle brush or toothbrush to scrub the mould from the window frames gently. Focus on corners and crevices where mould may be deeply embedded.

2. For tough spots, add a bit of baking soda to your scrub brush for extra abrasiveness.

3. Keep scrubbing until all the mould is removed.

   
   

Step 5: Rinse and Wipe the Area

Once you’ve scrubbed the mould away, it's important to rinse the window frame to remove any remaining cleaning residue.

1. Dampen a clean microfiber cloth with warm water and wipe down the entire window frame.

2. Rinse the cloth frequently to avoid spreading mould spores.

3. Use a dry microfiber cloth or paper towels to thoroughly dry the window frame after cleaning.

Step 6: Check for Recurring Issues

If mould has built up significantly on your window frames, it’s essential to understand why. Here are some common causes:

• Poor ventilation

• Excessive condensation

• Leaking windows or frames

• Damp walls around the windows

  
  

Fixing these issues is crucial to preventing mould from returning. Ensure your home is well-ventilated, particularly in rooms like kitchens and bathrooms, where moisture levels are high.

Step 7: Prevent Mould from Returning

Preventing mould growth is much easier than dealing with a full infestation. Here are some practical tips to keep your window frames mold-free:

• Regular cleaning: Clean your window frames every few weeks with a mild detergent to remove dirt and moisture buildup.

• Use a dehumidifier: This can help reduce moisture levels in rooms where mould is a recurring problem.

• Improve ventilation: Use extractor fans in bathrooms and kitchens, and open windows regularly to allow fresh air to circulate.

• Condensation control: If condensation is frequent, consider fitting double-glazing or using window insulation film during colder months.

• Inspect for leaks: Ensure there are no leaks in your windows or frames, as even a small leak can cause dampness and mould.

  
  

When to Call a Professional

In some cases, you might find that mould keeps returning despite your best efforts to clean and prevent it. If the mould has penetrated deep into the window frame materials, or if it’s affecting a large area of your home, it may be time to call in a professional window cleaner or mould remediation expert.

Professionals will have specialised equipment to safely and thoroughly remove mould, and they can assess any structural issues that may be contributing to mould growth, such as leaks or poorly installed windows.

Final Thoughts

Removing mould from window frames can seem like a daunting task, but with the right tools and techniques, it’s entirely manageable. By addressing the root cause of moisture and ensuring regular cleaning, you can keep your window frames mould-free and maintain a healthy living environment.

If you found this guide helpful, don’t hesitate to share it with fellow UK homeowners looking to keep their windows in top shape! Regular maintenance is the key to preventing mould from becoming a recurring issue in your home.