Composite decks are made of wood, fiberglass, and plastic. They are a great investment for homeowners who want to have a deck that is sturdy and long lasting. There are many ways to clean composite decks, but most people use a pressure washer with a high-pressure nozzle to remove grime and residue from the surface. Using a Pressure Washer It is important not to use a pressure washer with a pressure higher than 3000 psi. If the force is too great, the coating on your deck may be damaged. Before you pressure wash, you should spray soap on the areas you intend to clean. This will aid in the breakdown of any residue and make it easier to wash away. When you’re done cleaning, it’s important to rinse your deck thoroughly. If excess soap or dirty water from cleaning is left to dry, it will form a glossy film on your deck’s surface. Scrubbing With Soap If you don’t have access to a pressure washer, you can remove dirt and grime using warm soapy water and a soft bristle brush. When cleaning, scrub gently to avoid damaging or scratching the deck’s outer surface. When you’re done, thoroughly rinse you deck with a hose to remove excess soapy water.