How to Clean Composite Decking

You have a gorgeous new composite deck — and you plan to keep it that way. One of the first things you need to know is how to clean composite decking, and how to clean it safely. At Keystone Custom Decks, we’re one of the main composite deck builders in Chester and Lancaster Counties, and we’re here to help everyone learn how to clean their composite deck. Watch our video to learn more, direct from the experts:


The 5 Steps for Composite Deck Cleaning & Maintenance

Composite decking is a low maintenance product that will never require re-staining or re-painting, unlike wooden decks — that’s probably one of the main reasons you chose it. However, there are a few key things you need to know before washing your Trex or TimberTech brand composite decking.

How easy is cleaning composite decking? You’ll want to start with the following tools you likely already have around your house:

    • Bottle of dish soap
    • Medium stiffness nylon broom
    • Bucket of warm water

Once you’ve assembled these items, you’re ready to get started. Here are the steps we recommend to safely clean your composite deck:

  • Preparation: Remove all furniture, décor, and accessories from the deck surface. This ensures that nothing will get in the way during the cleaning process.
  • Step 1: First, you’ll want to sweep the deck with the broom to remove any larger or loose debris before you start the main cleaning.
  • Step 2: Next, you’ll want to rinse the deck with warm water to get it ready to be soaped up.
  • Step 3: After this, you’ll prepare a solution of gentle dish soap and warm water. Then you’ll want to dunk the brush head into the deck cleaning solution.
  • Step 4: During this composite decking cleaning step, you’ll use the soapy broom to scrub down the deck, using good pressure to get into the grooves and clear away difficult to remove dirt and grime.
  • Step 5: Once you’re finished carefully washing the deck surface, you’ll want to rinse away the remainder of the soap and any leftover dirt. This should leave your deck spotless and clean!

However, if you’ve tried this and your deck surface still won’t get clean, you’ll need a cleaning solution that’s a bit stronger. Each deck manufacturer includes a list of approved stronger cleaners — that bust dirt without damaging the deck surface. Check the manufacturer’s maintenance guide to find the current list of heavy-duty cleaners that leave the composite deck boards — and your warranty — intact.

Learn more about removing snow and ice from composite decking.

Can I Pressure Wash a Composite Deck?

can I pressure wash a composite deck

One of the most common composite decking maintenance questions we receive is, “Can I pressure wash a composite deck?” The answer is yes, you may! However, you need to be careful when you do so.

These are the manufacturer and experience-backed rules to keep in mind when using a pressure washer to clean composite decking:

  • Use a fan tip on the pressure washing system. This ensures that the spray is not concentrated enough to damage the deck surface.
  • Never exceed 1,500 PSI on your pressure washer to ensure that you don’t damage or score the beautiful deck surface.
  • To further prevent damage while maintaining your deck, you’ll want to keep a good distance from the deck surface. This should be enough to destroy any dirty areas without hurting the deck boards underneath.
  • Clean with the deck grain on individual boards — when using a power washing system, you’ll want to direct the spray to match the grain on a single board. This ensures that you don’t accidentally score or mark the surface by going against the grain or by crossing over multiple boards.

Now you know how to clean a composite deck — and how to pressure wash it safely!

Trust Keystone to Build Your Dream Composite Deck

While there’s no doubt we’re experts when it comes to learning how to clean composite decking, our true specialty comes from building stunning outdoor living areas. We are a premier luxury deck builder in both Pennsylvania and New York — and we’d love to bring our expertise to your project.

Explore our project gallery to see what we can build for you.

We encourage interested homeowners to bring the Keystone expertise to their outdoor living space — contact us for a free consultation today!

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