Remove mould from walls? This is how to do it properly

Mold on walls is more common than you think. It occurs mainly in rooms where a lot of moisture lingers, there is little ventilation or where there are large temperature fluctuations. Apart from not looking pretty, it can cause serious damage to both your home and your health. Therefore, it is important not only to remove mould, but also the underlying cause thoroughly.

21/11/2025

How does mould appear on walls?

Mold in the home occurs when too much moisture is present for long periods of time. This means that the humidity above the 60%. Causes can range from condensation and leaks to rising damp or wall penetration.

When a cold surface of your wall comes into contact with warm, moist air, this moisture precipitates on the wall. These are exactly the conditions in which mould can grow without a problem. Especially the bathroom This makes it a favourite spot for mould.

black mould example

Here's how to remove mould on your walls in 5 steps

Step 1: preparations

Make sure you have the following materials:

  • Bucket
  • Sponge or brush
  • Microfibre cloth
  • Hot water
  • Soda, cleaning vinegar or mould cleaner
  • Possibly a plant spray.

Before you start, it is important to work safely and efficiently. Because you will be working with corrosive agents, we strongly recommend wearing rubber gloves and a protective mask. Also, cover furniture and floors with plastic or old sheets so that no cleaning agent gets on them.

Step 2: prepare the space

Open windows and doors so that there is sufficient ventilation. This reduces the amount of mould spores in the air during cleaning.

Step 3: make the cleaning solution

Mix warm water with baking soda (about two tablespoons to a litre of water). Soda is effective and safe for most wall types. Want extra strength? Then we recommend getting a special mould cleaner from a specialist shop, or knocking on the door of a professional damp-proofing company.

Step 4: apply the cleaning solution to the wall

Apply the mixture with a sponge, brush or plant sprayer. Let it soak in for a while so that the mould comes off. To remove the mould on the wall, it is best to scrub the area firmly but gently so that you do not damage the wall. Then wipe the wall with clean water and a cloth so that no residue remains.

Step 5: let the wall dry out completely

Let the wall dry completely. Open a window or use a fan to speed up the process.

Our tips to really get rid of all moulds

Preventing mould from recurring starts with addressing the real cause.

  • Look beyond your nose. Mould is in most cases a result of an underlying moisture problem. As long as this problem is not solved, the chances of the mould on the walls continuing to return are very high.
  • Prefer not to use javel or chlorine on painted walls. It can cause discolouration and is less effective against deep-seated mould.
  • Repainting alone without cleaning also does not solve the problem. The mould will always come back.

It is also wise to take measures to prevent the mould from coming back.

  • Good ventilation is the most important step here. Open a window daily, use a ventilation system or switch on a fan in damp rooms, such as the bathroom.
  • Insulation can also help thermal bridges reduce. Consider improving facade insulation, replacing single glazing or tackling damp exterior walls.
  • Finally, small daily habits make a big difference: don't dry laundry inside, let damp rooms dry properly after use, and keep furniture a little away from the wall to allow air to circulate better.

In these situations, it is best to call in a professional to permanently remove moulds

It is important not to underestimate mould on your walls. Do you recognise any of the following signs?

  • The fungus covers a large area
  • He keeps coming back, even after cleaning
  • The wall shows signs of structural deterioration

In that case, professional help is the best choice. Experienced experts can thoroughly investigate the cause and fix it safely. This also applies if you have health complaints or suspect a hidden leak. A specialist can accurately assess the situation and provide appropriate solutions.

Get assistance from AquaConsult

Removing mould on the wall requires a combination of a good cleaning method and tackling the underlying cause. With the right preparation, safe working methods and attention to ventilation and moisture control, you can effectively combat mould and prevent it from coming back.

Are you suffering from moisture problems? Ask now a free moisture expertise to AquaConsult.

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