Composite decking materials are pretty resilient. Clean your deck twice each year to remove pollen, organic debris, dirt or stains. Generally, a broom or a blower will work better than a hose for removing scattered organic materials like leaves. Over time, especially with kids and pets, the deck may become soiled. Dislodge accumulated dirt with a broom or by using soap and water and a scrub brush. Scrubbing in the direction of the grain is best. Thoroughly rinse off with a garden hose.