How Do You Remove Black Marks from Composite Decking?

Henry A
How to
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Composite decking can transform a lifeless outdoor area into a beautiful and cosy living space. However, it only takes a few black marks to make the decking look unattractive. For this reason, many use dark-coloured Ultradecking to make it less noticeable. Regardless, you will want to eliminate the problem as soon as possible. But the question is, how can you remove black marks in your decking?

Determine What the Black Marks Are

The first thing you will have to do is identify what the black marks are, along with what caused them to appear. Are they only black stains from various objects? Or perhaps they are scuff marks from boots and shoes. They can also be deep scratches that may need attention and fixing.

Identifying what the marks are will help you find a more suitable solution. What works on stains will not work to fix scratches. Besides knowing what methods to use, knowing what the marks are can help you prevent them from appearing in the future.

Removing Black Marks

how to remove marks from composite decking

Now that you know what the cause and what the marks are, here are a few things that you can try to remove.

For Black Stains

For black stains left by various objects, such as ink or dirt, you will want to try cleaning the decking first. To give composite decking a thorough clean, you can use a mild soapy water solution. With a soft bristle brush, gently scrub the stained area. If the stain persists, you can try using stain-removing products for decking. However, it’s best to avoid using abrasive and harsh chemicals, such as chlorine bleach. Instead, use approved cleaning products such as hydrogen peroxide solutions. You will want to contact your decking board manufacturers for more information on what you can use.

For Moulds and Mildew

Another common cause for black marks appearing on your decking is mould growth. While composite decking is more resistant to fungi, it can still grow if not properly maintained. If it happens, you can use either commercial mould and mildew removers or DIY cleaning solutions. If you want the latter, you can try using vinegar and baking soda. To use them, scrub the mouldy part with soapy water. After rinsing, pour vinegar on the affected area and sprinkle some baking soda. Let it sit for a few minutes. Then, scrub it with a brush. Do not let the baking soda and vinegar solution dry out. Repeat if necessary.

For Scuff Marks

The black marks on your decking can also be scuff marks caused by high heel shoes and boots. They can be stains, or they can be minor scratches. If it’s the former, you can clean and scrub it away. But if they have caused scratches, don’t fret. There still are a few things that you can do. For minor ones, you can try using a wire brush to blend the scratches away. However, for boards with grained textures, you will want to do it as gently as possible. Too much brushing can be abrasive and remove the patterns or textures.

For Deeper Cuts

If the black marks are deep cuts or scratches, don’t worry. Before doing any board replacement, there are still a handful of things that you can do. One of the most used tricks is using a heat gun to blend the cuts. While being the most effective, it can be risky when done improperly. You may want to do some practice before attempting it on your decking. Holding it too close to the surface for too long can leave permanent burn spots. But when done correctly, it can make your decking look as good as new.

Decking Repair Kits

Another option that you can try is to use decking repair kits. They are often composed of fillers, either wax or epoxy-based, applied directly to the cuts and scratches. Lastly, you can try using wood stains that match the colour of your decking. Not only does it make the marks unnoticeable, but it also protects the exposed parts of the boards.

These are only a few solutions to common causes of black marks on composite decking. If you are still unsure, you may want to contact your board’s manufacturers for technical assistance. They can point you in the right direction when it comes to fixing these problems.


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