How do you clean these boards - scrub, power wash, rinse off with hose, deck cleaner?

Hello, and thank you for your interest in Trex! For cleaning Trex recommends warm soapy water using a mild dish detergent such as Dawn. Scrub with a soft bristle brush and rinse. You can pressure wash as well up to 3,100 psi max, with a fan tip attachment, and no closer than 8 inches to the deck surface. Hope this helps answer your question. Thanks, Tori - Trex Customer Care Team