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How to Remove Mould from Walls

How to Remove Mould from Walls

Removing mould from your home is not exactly anyone’s favourite thing to do but removing it promptly and effectively is critical for a safe and healthy home.  

Here we will outline how to remove mould from walls, how to prevent it and when to call in the experts. 

How to Remove Mould from Walls

For small mould spot removal, there are several DIY remedies using household products and mould treatments. However, these will only serve as a temporary solution. Unless the cause of the problem is remediated, mould will continue to return. 

With that being said, do not attempt to remove any patch of mould larger than the palm of your hand yourself. Removing large patches of mould can not only aggravate the spores to spread further around the home, but it can also put you at risk of inhaling toxic mould spores. 

What Can You Use to Remove Mould from Walls?


  • Firstly, put on your mask, safety glasses and gloves and ensure all windows are open to allow for fresh air.   
  • Mix 1:10 ratio of bleach and warm water in a bucket. 
  • Dip a microfibre cloth in the solution and squeeze out excess liquid out. You can also use a toothbrush for small, difficult to reach areas. 
  • Wipe the mould-affected area in a circular motion. 
  • Using a dry microfibre cloth, press against the clean areas to dry the wall. Do not rub. 

Bleach is a common DIY treatment for small spot removal. But be warned, bleach will not kill mould spores and can damage paint or wallpaper. Because of this, always complete a small test patch prior to mould removal. 


For a non-chemical-based solution, you can use vinegar. Always ensure you put on your mask, safety glasses and gloves.  

  • Fill a spray bottle with straight vinegar, no water. 
  • Spray the mould affected areas and let sit for one hour. 
  • Dip a microfibre cloth into half a bucket of water and squeeze out excess liquid. You can also use a scrubbing brush for hard to remove mould. 
  • Wipe away the mould from affected areas. 
  • Press a dry microfibre cloth against all the cleaned areas. Spray the area with straight vinegar again and leave to dry naturally.  

Note: never mix vinegar and bleach as it creates a toxic vapour. 

How to Remove Mould from Bathroom Walls

Store-bought chlorine bleach is a popular method for removing mould from bathroom walls, using the following method: 

  • Spray the bleach cleaner on the mouldy surface and allow to sit for about 30 minutes 
  • Scrub with a stiff brush 
  • Rinse with warm water 

Always read the instructions carefully on the product. Ensure that you are wearing protective gloves and face mask to avoid inhaling or coming into contact with toxic fumes.

How to Remove Mould from Plaster Walls

Plaster walls can absorb excessive amounts of moisture when exposed to humid or damp conditions. So, if water sits on the wall for an extended period, mould can easily begin to grow. 

  • Mix a non-ammonia-based soap with water and make suds.  
  • Dip a stiff bristle brush in the water and scrub plaster with soap and water.  
  • Rinse the area with clean water.  
  • Mix 1 cup bleach into 4.5L of water and apply the solution to the wall with a sponge.  
  • Set up a fan aimed at the wet spot on the wall to dry the surface quickly. 

How to Remove Mould from Painted Walls

For a temporary solution, you can use a store-bought mould wash to remove mould from painted walls

  • Prepare the surface of the wall by gently scrubbing it over with a hard-bristle brush until it has a smooth finish. 
  • Following the product directions, wash down the area with diluted wash treatment and a sponge.  
  • Allow the area to dry thoroughly. 

How to Remove Mould from Rendered Walls

Mould spores can easily settle on coated surfaces like render, drawing nourishment from the coating or dirt on the surface. To temporarily remove mould from render, you can do the following:  

  • Mix a 1:3 ratio of bleach and water in a bucket. 
  • Use a scrubbing brush or heavy-duty sponge to vigorously scrub the mould-affected wall with the solution until the mould spots have disappeared.  

It is important to note that DIY mould removal treatments only act as a temporary solution. Seeking out a professional mould removal service team can help remove the mould safely and provide a long-term plan for future prevention.  

Is Mould on the Walls Dangerous?

Yes. Mould growing on walls is not only unsightly, but it can also be dangerous to your health. Common symptoms of inhaling mould spores include: 

  • Headaches 
  • Coughing 
  • Dizziness 
  • Fever 

In some cases, exposure to black mould can lead to more serious health problems. Symptoms of black mould poisoning can include: 

  • Vomiting 
  • Nausea 
  • Respiratory complications 
  • Asthma 

Why Does Mould Grow on Walls?

Mould needs moisture to grow. So, if there is condensation, spills or moisture build up on walls, mould will thrive. The most common areas you can find mould are in the bathroom, kitchen, and even in your bedroom or wardrobe. As a result, when mould starts growing on the walls, it can be exceedingly difficult to stop the spores spreading to the rest of the house. The three main causes of mould on walls are: 

  • Condensation 
  • Humidity 
  • Water Damage    

Mould on Kitchen and Bathroom Walls

The kitchen and bathroom are typically the household rooms most susceptible to mould. Why you ask? Because they are often enclosed areas with high levels of exposure to steam and humidity without enough ventilation.  

Mould on Bedroom Walls 

Bedrooms are often susceptible to elevated levels of condensation, especially around window sills and door frames. When this is paired with poor ventilation in areas like wardrobes and under the bed – it provides the perfect breeding ground for mould.  

Signs of Mould on Walls

Once you spot mould growing on your walls or other areas of the home, chances are it already has millions of spores taking hold and spreading. If you suspect you might have a mould problem, some key signs to look out for include: 

  • An odd, musty smell 
  • Moisture or condensation 
  • Water damage or leaking pipes 
  • Peeling or cracked paint 
  • Bulging and discolouration 

When to Call a Mould Removal Professional

If you are afraid of mould on your walls becoming a problem in your home and are looking for a long-term solution, be sure to call upon a professional team to help you. The MouldMen team will inspect, treat and provide you with a Mould Management and Prevention Plan to ensure that your home is kept safe and free from mould. Call us on 1300 60 59 60 to book your free inspection today. 

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