How To Clean Mould Off Walls

Mould is the worst nightmare for every household! It’s a widespread problem that you shouldn’t look the other way, as it’s very harmful to both your health and home structural issues. Once the first signs appear, you need to get rid of it, find the source of its creation and correct any damage that causes it.

A wall next to a window full of mould

Mould is very harmful, especially for the elderly, babies and people with respiratory problems and allergies. It can trigger allergic reactions, irritate eyes, nose, throat, and skin, cause breathing problems, and generally affect the immune system. Hopefully, mould signs on the walls can be easily cleaned with materials you already have at home. It would be best if you took action the sooner possible to prevent black mould from building up. 

What is mould?

You might find yourself asking “what exactly is mould?”. Well, mould is a fungus. It needs moisture and warm air to grow, conditions found in houses. It flows around the house and sits on every porous surface. Black mould spores are the most typical signs on walls. 

High levels of humidity, poor ventilation and rising damp are the main reasons for mould to develop. Rooms with high humidity levels, like kitchens and bathrooms, rooms that aren’t well ventilated or even a pipe leak that you may don’t know about, can lead to mould problems.

A white wall full of mould

Signs of mould on the walls

Several signs can ensure mould growth in your house and on your wall. Some are visible, whilst others aren’t. 

  • Water stains
  • Dark, black, green, grey, white or brown spots
  • Discolouration
  • Peeling, bubbling or cracking on the paint of the wall or your wallpaper
  • Musty smell

In case you notice one of the above signs, then the time has come for you to start getting rid of it. Below you’ll find handy methods to achieve your goal.

How to clean mould from walls

Several cleaning methods can help you get rid of mould build-up. You can find special cleaning products, or you can make your own with more natural ingredients. Let’s see some handy methods.

A woman cleaning the mould off a wall

Cleaning mould with bleach

It is a potent chemical-based disinfectant. To get rid of mould, you’re going to need:

  • A bottle for spraying
  • Bleach
  • Water
  • A brush
  • A cloth

Now, follow these steps:

  1. Mix one-part bleach to three-parts water in the bottle.
  2. Spray the mouldy area with the solution.
  3. Use a brush to scrub the affected spots.
  4. Wipe with a damp cloth very well.

Cleaning mould with white vinegar

Vinegar is an effective natural disinfectant used to clean most household surfaces and items. It’s also effective enough to kill mould found on walls

A cleaning solution made of white vinegar

To make your vinegar mould cleaner, you’ll need:

  • A bottle for spraying
  • Vinegar (white)
  • Water
  • A cloth/towel

Then:

  1. Pour vinegar into the bottle and spray the trouble area
  2. Leave it on the surface for an hour
  3. After an hour has passed, wipe the surface with a cloth soaked in clean water.
  4. Let it dry

Cleaning mould with baking soda

It is effective in absorbing smells. It’s also great for cleaning and removing tough stains from surfaces, like mould

Needed materials: 

  • A bottle for spraying
  • One-quarter of a tablespoon of baking soda
  • Water
  • A scrub brush

Some baking soda on a wooden surface

Once you’ve gathered all the ingredients, follow these steps:

  1. Mix one-quarter of a tablespoon of soda with water in the bottle. Shake the bottle very well to dissolve the soda.
  2. Spray the stain with the solution.
  3. Scrub the stained surface with the brush to remove mould signs.
  4. Next, rinse the area with water to remove leftovers.
  5. Finally, spray again with the soda mixture and let it dry. Don’t wipe. Allowing the mix on the surface will kill mould and will prevent it from reappearing.

Cleaning mould with baking sodawhite vinegar combo

 If you want to create a really powerful black mould remover, then you need:

  • A bowl
  • Baking soda
  • Vinegar (white)
  • Water
  • A sponge
  • A towel

white vingear baking soda and a spraying bottle for cleaning

Then:

  1. Mix 2 parts soda, one part vinegar and one part water in the bowl.
  2. Stir very well to create a thick paste
  3. Spread the paste on the surface and let it dry.
  4. Scrub with the sponge in the affected area and wipe with a towel soaked in water.

Cleaning mould with Borax

It is a powdery mineral used for cleaning purposes. It helps to get rid of stains but also mould and mildew. This method will prevent it from regrowing as well.

To get rid of mould, you need:

  • A spray bottle 
  • A cup of borax
  • A gallon of hot water
  • A brush
  • A towel

Some cleaning products with borax

Now, do as follows:

  1. Mix in the bottle a cup of borax and a gallon of hot water. Shake very well to dissolve everything.
  2. Spray the trouble area and scrub with the brush until you remove the mould.
  3. Finally, wipe it with a dry towel

Note: You don’t have to rinse the solution.  

Cleaning mould with hydrogen peroxide

Hydrogen peroxide is an excellent antibacterial and antifungal agent, effective against mould too.

You need:

  • 3% hydrogen peroxide
  • A towel

Now:

  1. Apply hydrogen peroxide on the wall and let it sit for 15 minutes
  2. Then, wipe dry with a clean towel. 

How to remove mould from painted walls

Mould on painted interior walls needs quick action. You should act as soon as possible to prevent the mould from spreading and covering larger areas creating more serious problems.

These are all the needed materials:

  • Vinegar (white)
  • Warm water
  • A spray bottle
  • A sponge
  • Dishwashing liquid detergent
  • A dry clean towel

Cleaning a painted wall from mould

The steps to successfully remove the mould are:

  1. The first step is to remove all the decorative items from the wall. It would be best to cover the floor with an old sheet or towel to protect the floor from water spills. 
  2. Next, clean the affected area from any dirt and debris. Mix warm water and dishwashing detergent. Soak a sponge into the soapy water and wipe the wall.
  3. After that, mix equal parts of warm water and vinegar and apply them to the stained wall
  4. Scrub with the sponge and rinse with water. Then, wipe with a dry towel.

How to remove mould from drywall 

Drywall is a porous surface that makes it easier for mould to penetrate the structure’s inner parts. Unfortunately, the only way to get rid of it is to replace the affected surface. 

Let’s see what exactly you have to do:

  1. Remove the affected drywall.
  2. Spray a vinegar/borax solution. The vinegar-borax combo will sanitise the surface and prevent future mould growth

How to remove mould from grout

Mould found in there is probably the toughest part to remove. It might be a little time-consuming, especially if there’s a large area to cover. You can clean it either by using branded cleaning products or by DIYing it. 

The natural way

The ingredients and tools you need are:

  • Baking soda
  • Vinegar (white)
  • A bowl 
  • An old toothbrush
  • A clean cloth

grouts full of mould

Now, follow these steps:

  1. Mix in a bowl some soda and vinegar to make a paste
  2. Use a toothbrush to apply this paste on the grout lines and start scrubbing. 
  3. Let the paste sit for about 30 minutes.
  4. Then, rinse the surface with cold water and use a clean cloth to wipe the residue.

The bleach way

 You can still try this method. Just every time you use bleach, always put on gloves and open the windows and the door. 

For this method, you need:

  • A pair of gloves
  • Bleach
  • A stiff-bristled brush
  • A cloth

A woman using bleach to clean the mould from the walls

Now:

  1. Dip the grout brush in bleach and start scrubbing. 
  2. Once you finish, use the clean, damp cloth to rinse the residue.

Note: Whichever method you choose to repair mould problems, you should always wear rubber gloves and keep the window open to ventilate the room. 

Tips for preventing mould

Cleaning mould from walls isn’t enough. It would be best if you found a way to prevent it from reappearing. Here are some tips that will help you keep mould out of your walls. 

  • Open the windows every day to let fresh air dry your place from moisture.
  • Use a dehumidifier.  It will remove excess moisture from the inner atmosphere and bring humidity levels to normal. 
  • Avoid drying clothes inside your house. Drying your laundry inside rises moisture levels helping mould spores to grow. However, if you have to dry your garments inside, make sure you open windows and close the room’s door where you dry your laundry.
  • During and after you shower, always open the window or the extractor fan to dry the bathroom and not allow condensation and moist air to flow around the rest of the house.
  • Paint your walls with anti-mould paints

A man cleaning the mould from the walls

Mould is a big problem for houses. But you don’t have to worry about it anymore. Dealing with it at the first signs and taking some precautionary actions can stop it from spreading and ensure that it won’t return. Several commercial mould removers are available in the market. But if you don’t want to spend your money, you can always use household materials and create your DIY mould removers.

Next project: How to clean mould from wood

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