How to Clean a Trex Deck

Three Parts:General Cleaning and Mold/Mildew RemovalRemoving Ground-In Dirt, Grime, Pigment Staining and Rust StainsRemoving Food, Oil or Grease Stains

Trex makes its products using plastic fibers from grocery bags and wood fibers from old pallets and sawdust. Trex decks are becoming more and more popular because they are durable and basically maintenance free. However, you will need to clean a Trex deck from time to time. If you know how to clean a Trex deck, you can remove stains and maintain the original look.

Part 1
General Cleaning and Mold/Mildew Removal

  1. Image titled Clean a Trex Deck Step 1
    Rinse the deck with a hose that has a powerful spray nozzle to remove dirt and grime from the surface.
  2. Image titled Clean a Trex Deck Step 2
    Mix a small amount of soap with warm water in a bucket and wash the Trex deck with a soft brush to get all the remaining dirt from the embossing.
  3. Image titled Clean a Trex Deck Step 3
    Rinse the surface again until you have removed all the soap and dirt.

Part 2
Removing Ground-In Dirt, Grime, Pigment Staining and Rust Stains

  1. Image titled Clean a Trex Deck Step 4
    Apply a product to brighten the deck. You can find deck-cleaning products safe for use on Trex products by searching "Eco Friendly Composite Deck Cleaner." Use the product according to the manufacturer's directions.
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    Allow the cleaning agent to sit on the stain for 10 – 15 minutes.
  3. Image titled Clean a Trex Deck Step 6
    Rinse with a hose.

Part 3
Removing Food, Oil or Grease Stains

  1. Image titled Clean a Trex Deck Step 7
    Remove the food or spill as soon as you possibly can.
  2. Image titled Clean a Trex Deck Step 8
    Rinse the area with hot water.
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    Find a cleaning agent designed to restore Trex decks. Test the product in a small inconspicuous area to make sure it will not compromise the color of the deck.
    • Use the product per the manufacturer's directions to remove stains from Trex decks if the product does not fade the surface.
    • If the product does cause the surface to fade, use soap and water and a soft bristle brush instead.
  4. Image titled Clean a Trex Deck Step 10
    Rinse the area again.


  • If you have a stain warranty on your Trex deck, you need to remove the source of the stain, such as food or grease, within 7 days to maintain your warranty.
  • Proactively clean your Trex deck, at least twice (2 times) yearly, "spring and fall", as the Trex Company recommends, before stains appear or re-appear. Composites that receive routine moisture (rain, morning dew, snow, ice humidity, etc.), are in areas known for "mold spores", are under trees, or are actively routinely used, should be cleaned more often. For example, in the spring, summer, fall and winter. Proactively cleaning composites, such as Trex, before they receive moisture, and stains deeply saturate or root is the key to spending less time and money keeping them clean.
  • Abrasions, scuff marks, stains from leaves, stains from wood tannins and water spots will disappear with natural weathering within 12 - 16 weeks. However, you can speed up the process by applying deck brightener to the marks.
  • If you remove part of your Trex deck, call a Trex distributor and inquire about proper disposal. You cannot throw it into the trash or burn it.


  • Never sand your Trex deck to remove stains. This will cause permanent damage to your deck and will make your warranty invalid.
  • Do not use colored chalk lines on your Trex deck, as the markings are permanent. Use baby powder instead.
  • Do not use a pressure washer higher than 1,500 PSI or spray any closer than 12 inches (30.48 centimeters) from the surface when cleaning Trex products. If you use higher PSI or spray closer than the required limit, you could cause irreversible damage to the deck and void your warranty.

Things You'll Need

  • Hose
  • Spray nozzle
  • Soap
  • Soft brush
  • Cleaning agents

Article Info

Categories: Walls Fences and Decks