We have a front porch on our house made from Trex (composite wood and plastic material). It's starting to get this green looking stuff growing on it which I can only guess is mold. I did a little research on a mold site, and they recommend a pressure washer with at least 2400 psi and some specific detergents to remove it. The Trex website however, says not to use a pressure washer with more than 1500 psi and at a range of 10 feet or greater on there product. I was wondering if anyone had any mold removal experience. Thanks guys.