I had a Trex deck installed less than 3 years ago.Even though it has been cleaned with what they recommend it is full of mold and continues to be covered with mold within a week of cleaning.
Since composite materials are always recommend by DIY Network and HGTV about how wonderful these materials are from a maintenance standpoint, we hate ours. The Trex customer service is almost non-existence. We are going to tear ours out and put in a stone patio. Our deck is 12x20 with a 12x12 offset so it was a very expensive project.
What a disappointment.I would never buy Trex or composite material again.