cleaning composite trex decks
I have a trex deck with black marks like leopard marks on most of the boards. Looks like it might be mould. The deck is in the bright sun for most of the day and not all the boards have these marks on them. One long board is absolutely perfectly grey but the boards on either side are pocked marked. Tried a deck cleaner from home depot and it helped but the marks are still there. Anyone had a similar problem?