Can I use Dawn to wash my composite deck?

Can I use Dawn to wash my composite deck?

Yes, Dawn dish soap is a commonly recommended option for cleaning composite decking, especially mixed with warm water and applied with a soft bristle brush. It’s effective at cutting through everyday dirt, pollen, and light grease without the harshness of bleach or ammonia-based cleaners, which can damage a composite deck’s surface coating over time. For tougher stains or built-up grime, a cleaner specifically formulated for composite decking may outperform Dawn alone, but for routine maintenance cleaning, diluted dish soap is a widely accepted, low-risk choice. Always rinse thoroughly afterward, since leftover soap residue left to dry can create a filmy buildup on the surface. Avoid combining Dawn with a pressure washer’s detergent injection system at full strength, since it can create excessive foam.