I installed Trex decking to replace wood decking in the spring of 2007. By the fall, it was staining, I cleaned it that fall and again in the spring and several more times in 2008. This year I contacted Trex, they finally responded and told me to send them photos, then told me to use a deck wash and add clorox to kill the mold, but, it may lighten my deck.
I see there is a law firm that has filed a class action suit against them. I wish I had not spent $4,000.00 to remodel my deck with their junk.
I purchased my Trex decking at my local Lowe's store, they are not willing to do anything to assist.