When choosing a cleaning solution for your composite decking, you should select a good type for the decking. Knowing the right type of cleaner to use for your deck will also prevent any chances of damages. Bleach is a common cleaner used in cleaning. Can you clean composite decking with bleach?

Why Do Deck Owners Use Bleach For Deckings? 

It is believed that bleach can kill mold and remove mold stains quickly; that’s why most decking owners buy bleach. Mold can grow on composite decking if you don’t clean your deck regularly. Besides that, when the deck is exposed to moisture, it can accelerate mould growth on the deck.

 To get rid of the mould, some homeowners use bleach on the deckings. But does bleach kill mould? Bleach can not kill mould on porous surfaces like composite decking. Although it can kill bacteria and other organisms on non-porous surfaces, it doesn’t work for mould on porous surfaces. 

Chlorine bleach is the most common bleach sold in stores. It is also known as Sodium Hypochlorite. It is a cleaning agent used in cleaning to remove stains fast. When there is a stain on your composite decking, you may be tempted to use bleach. Bleach removes stains quickly by making the surface area white or colourless. But is it safe to clean composite decking with bleach?

Is It Safe to Clean Composite Decking With Bleach

Can You Clean Composite Decking With Bleach?

If you apply bleach to remove stains on composite decking, the bleach can remove the stains quickly in minutes. Most time, deck owners with mould stains on their decks have used bleach to remove the stains. Of course, bleach can give you a quick fix when removing stains, but it comes with a price. If you apply chlorine bleach on composite decking, the bleach will end up damaging your deck. How?

Chlorine bleach removes stains by making the area white or colourless. If you apply bleach on composite decking, the bleach will damage the decking colour. It will fade the colour of the composite decking, thereby damaging its looks. Apart from fading the decking colour, bleach can also cause serious damage to the entire decking.

 We all know that, unlike wood decking, composite decking can not crack or splinter. But if you apply bleach to your composite decking, the bleach will react with the decking. It will make your composite decking chirp, crack, or splinter.

In addition, bleach is also corrosive to metals. When applied regularly on a deck, bleach can damage the fasteners that hold the decking in place. When this happens,  the deck will collapse. It will lead to the entire breakdown of your deck.

Can You Clean Composite Decking With Bleach?

Considering the effect bleach can have on composite decking, the response to the above question is No. It is not recommended to clean composite decking with bleach. Chlorine bleach contains sodium hypochlorite, which can ruin your entire decking. 

Apart from damaging your deck, bleach is also a toxic chemical. If you accidentally come in contact with bleach, it can irritate your skin. Exposure to chlorine bleach can also cause serious headaches, respiratory problems, vomiting, and more. 

 Applying bleach to remove any kind of stains on the composite decking can cause irreparable damage to the decking. Bleach can cause your composite decking to splinter. It can also damage the entire decking. The cost to replace an entire deck can be very expensive. However, you should avoid using bleach to clean your composite deck.

If you want to clean dirt off your composite decking, you can use soapy water. For oil or grease stains, use hot water and soap. You can also apply baking soda and vinegar to get rid of oil stains. For mold stains, pour a mould remover on the mould and use a bristle brush to scrub the affected area.


You should not clean composite decking with bleach. Regular use of bleach to clean composite decking can damage the entire deck. It can cause your composite deck to chirp, splinter, or crack. In addition, bleach can also corrode the deck fasteners, thereby collapsing the deck.