No matter what decking you choose to install you’ll get surface dirt. For composite decking, it’s recommended that you simply wash down your deck occasionally with soapy water and a brush.
If you do drop something like food or drink on your deck, Trex® decking is guaranteed not to stain from normal household chemicals if cleaned up within a week.
If you’ve got a new composite deck (everything but 1st generation), there’s no need to worry about mould.
All high-quality composites are mould resistant, meaning you’ll only need to clean your deck occasionally with soapy water for to maintain its aesthetics.