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How To Clean A Composite Deck

How To Clean A Composite Deck
By Kari N.
October 12, 2021

As a composite deck owner, you’ve got a great-looking deck and you want to keep it that way, right? While composite decks are designed to stand up to use over the course of time, regular use like weather and normal wear and tear require periodic cleaning. That means finding the right cleaner and knowing the proper steps to take to care for your composite deck. We’re here to help with suggestions on how to clean a composite deck with two of our most popular composite decking brands: TimberTech/Azek and Trex.


Cleaning a TimberTech / Azek Deck


Essential Equipment:

  • TimberTech Deck Cleaner
  • Scrub brush with a long handle (soft, natural fiber bristles)
  • Gallon bucket
  • Water hose
  • Pressure washer*

*A pressure washer should ONLY be used for rinsing. Be sure to use the fan tip attachment at no more than 1500 psi. If you try to remove stains with a powered washer, you risk damaging the composite material. Keep the nozzle at least 18 inches above the decking and spray in the direction of the grain. Going against the grain can distort the panels and ruin the appearance of the decking.



Complete Deck & Spot Cleaning


  1. Shake well and dilute the TimberTech cleaner mixing one (1) part cleaner and three (3) parts water. Use one (1) gallon of diluted solution to clean 1000 square feet.
  2. Work in small sections at a time to keep the cleaner from drying before it is rinsed off. Scrub the solution in the direction of the grain with downward pressure, then change direction and work against the grain to clean thoroughly.
  3. Wash the solution immediately with a water hose or pressure washer* and be sure to remove any trace of the cleaner. Remnants of the solution can create a film that is difficult to remove without repeating the cleaning process.
  4. Use a towel to mop up any pooling water to be sure the deck dries quickly.


Cleaning a Trex Deck


Essential Equipment

  • Gallon bucket
  • Soap
  • Soft-bristled brush
  • Water hose
  • Pressure washer* (only as needed)

*Pressure washer with a maximum setting of 3100 psi.


Maintaining the beauty of your Trex deck is done in just a few easy steps. A simple scrub with warm soapy water is typically all it takes to keep your Trex deck looking its best. To see just how easy cleaning your Trex composite deck is, watch this short video.



Yearly Maintenance


Not only will frequent cleaning keep your composite deck looking new, but it will also extend the life of the deck. Do not allow dirt and debris to sit on the deck's surface. Additionally, rinsing your deck off with a water hose weekly (especially in the spring and summer months) can minimize the need for heavy cleaning. 



Shop DIYHomeCenter.com to find more TimberTech and Trex products.