Cleaning composite decks is important to keep the material looking its best. Composite decking materials are quite resilient, you will need little more than a simple cleaning solution and a common garden hose to maintain a composite deck that looks and functions just as well as the day it was installed. Mold, mildew, dirt, oil, leaf-stains, and food and drink spills harm the appearance and value of your beautiful, expensive composite deck. Home-remedy and conventional hardware-store deck cleaners and sealers aren't made for composite decks. Their results may be unpredictable