Although composite cladding is resistant to moisture and, in turn, mould, that does not mean that it is immune to it. Sometimes, within certain circumstances and conditions, mould may grow on the surface of your composite cladding.

Mould is drawn to conditions that are damp and humid. Moisture can breed bacteria, which leads to mould growth that is not only unsightly but can also damage your composite cladding. If you already have mould growing on your composite cladding or are looking at how to prevent it, this article is for you!

How to Remove Mould from Composite Cladding?

Tips When Removing Mould from Your Composite Decking:

  • Use protection. It is always advised to wear protective clothing when dealing with mould such as gloves and even a mask to avoid contact with mould spores. Coming into direct contact with mould can cause irritation, allergic reactions and even asthma attacks, so always proceed with caution.
  •    Gentle Cleaning Solutions – Always begin with the least aggressive cleaning solutions and methods. Mix a mild detergent or dish soap with water to create a soapy solution. Apply the soapy mixture to the affected areas using a soft brush or cloth. Gently scrub the mould-infested spots, focusing on one section at a time.
  •    Vinegar Solutions – Vinegar is a natural and effective mould remover. Create a solution of white vinegar and water, using a ratio of one part vinegar to one part water. Apply the solution to the mould-affected areas and let it sit for 15-20 minutes. Scrub the cladding with a soft brush to remove the mould. Vinegar not only cleans but also helps prevent mould from returning.
  •    Baking Soda Paste – Baking soda is known for its mild abrasive cleaning properties. Create a paste by mixing baking soda with water, and applying it directly to the mouldy areas. Allow the paste to sit for some time, ensuring it penetrates the mould. Scrub the surface gently with a brush, and then rinse thoroughly.
  •    Mould Cleaners – There are specific mould cleaners on the market; if the mould persists, consider using a commercial mould cleaner. Select a product specifically designed for composite materials and follow the manufacturer’s instructions carefully. Many commercial cleaners are formulated to eliminate mould and prevent its recurrence. Apply the cleaner, scrub the area as directed, and rinse thoroughly. It is always advised to test any product on an inconspicuous area of your cladding first.
  •   Hydrogen Peroxide Solution – Hydrogen peroxide is another effective mould remover. Mix hydrogen peroxide with water in a 1:1 ratio and apply it to mouldy areas. Allow the solution to sit for 10-15 minutes, scrub with a soft brush, and rinse well. This solution not only cleans but also disinfects the affected surfaces. Again, always test your composite cladding first before applying it to the entirety of your cladding.
  •   Avoid High-Pressure Washing– While it may be tempting to use a high-pressure washer for quick cleaning, avoid this method. High-pressure water can damage the surface of composite cladding and compromise its protective layer. Stick to gentle cleaning methods to ensure the longevity of your cladding. If you do decide to use a pressure washer, always keep it on a low setting and at a safe distance of at least 30cm away from the cladding surface. 
  •    Preventative Measures- After successfully removing mould, take preventative measures to discourage its return. Ensure proper ventilation around the cladding, trim vegetation that may obstruct sunlight, and keep the area clean. Regular cleaning with mild solutions can help prevent the recurrence of mould.
  •    Regular Maintenance- To prevent future mould issues, establish a routine maintenance schedule for your composite cladding. Regular cleaning and inspection can catch mould growth early, making it easier to address before it becomes a more significant problem.


In summary, removing mould from composite cladding involves a systematic approach, starting with gentle cleaning solutions and progressing to more potent methods if necessary. Safety precautions, regular maintenance, and following manufacturer guidelines are key to ensuring a successful and lasting mould removal process. By addressing mould promptly and implementing preventative measures, you can keep your composite cladding looking pristine and well-protected.

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