Composite decking does not only add beauty to your home, but it offers many benefits over traditional timber decking. One benefit of wood-plastic composite is that it is resistant to the elements like rain, heat and changing temperature. Another benefit of wood-plastic composite is that it is resistant to moisture. This will prevent swelling and rotting when you install your plastic wood decking. But for you to enjoy your composite decking, you must clean it. Cleaning or maintaining wood-plastic composite requires lots of care. Do your investigation before you start cleaning your decking. This will enable you to know the mistakes to avoid when cleaning composite decking.

Avoid Utilizing the Wrong Tools to Clean Your Composite Decking

Note that composite decking requires extra care when cleaning. If you install your plastic wood decking outdoors, you can do the normal cleaning of the surface with a broom and a garden hose. For a deeper cleaning of your composite decking surface, you should use a brush. Note that the kind of brush that you use should not be a hard one. 

You must utilise a soft brush to clean the surface of your plastic wood decking. If it is snow that you want to remove from the surface of your wood-plastic composite decking, you should choose a plastic shovel. This way, you won’t scratch the top of your composite decking when you are cleaning it. 

Avoid Using the Wrong Cleaner on Your Composite Decking 

The cleaner that you used to clean your composite decking matters. This is because the right cleaner can contribute to a longer lifespan for your decking, while the wrong cleaner can break your decking. When purchasing a cleaner for your plastic wood decking, you should never use one that contains chlorine. 

This is because using chlorine base cleaner on the surface of your plastic wood decking will destroy the beautiful appearance. So, if the active ingredients of the cleaner read Sodium Hypochlorite, then it contains chlorine. This kind of decking cleaner is not good for composite decking because it is corrosive and will eat right into your decking. Then, it will discolour your decking surface and damage the surface. 

If you want to preserve your composite decking, it is crucial to avoid using the wrong cleaner to clean the surface. The right cleaner is anything that does contain bleach and will remove the stain effortlessly. Sodium Percarbonate based cleaner is a non-toxic cleaner you can use on your composite decking.

Make Sure to Clean the Gaps

Another mistake homeowners make when cleaning their decking is forgetting to clean the gaps. The gaps we are referring to is the space between your composite decking boards. Plastic wood decking boards have a 5 mm space that separates the boards from one another. When cleaning their wood-plastic composite decking, most homeowners forget to clean the space. This makes debris or dirt pile in between their decking boards. And when dirt pile between the boards, it will breed mould or mildew. That is why cleaning the gaps between your decking boards is crucial. This will enable air to flow between the boards and keep the sides and under nice and dry. 

Avoid Pressure Washing Your Composite Decking

composite decking cleaning mistake

We don’t recommend pressure washing your wood-plastic decking because you can damage the surface. A pressure washer uses force to spray water on the surface of your wood-plastic decking. This force spraying can cause your decking surface to peel and the colour to fade. Composite decking surface is softer than traditional timber, so when cleaning your plastic wood decking, you should take extra care. 

Don’t bring the pressure washer too close to the surface of your decking. Keep the nozzle of the pressure washer some feet from the top of your decking to avoid peeling the surface. The alternative to using a power washer is a garden hose. A garden hose sprays water but not with much force as a pressure washer. It is perfect for rinsing dirt or debris from the surface of your decking. 

Protecting Your Composite Decking After Cleaning

After cleaning your WPC decking, you have to protect it. Protecting the surface of your plastic wood decking will prevent mould and mildew. The most effective non-toxic solution to protect your decking is by using a sealant that will prevent water from entering the decking’s surface.


Using a power washer, the wrong cleaner and the wrong tools are mistakes you should avoid when cleaning your composite decking.

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