I've had Trex for around 6 years in Springfield, MO. I have many friends that have tried a lot of other products to clean their Trex decks. They don't work. They recommended Corte Clean. I've now been using it for years. I'm a plant person and have a dog. The plant terracotta pots leave marks on the deck and mold grows where the water overflows. The dog makes other stains such as grease, etc. I have a couple of outdoor rugs that make a mess too. The sun changes the look. Your product makes it so you can't see where the rugs were. Once cleaned, your product makes my deck look like the day the contractor installed it. I'm not exaggerating. I'm really very picky, just like brand new. I have a young man that helps me clean it, as I am 81. We follow the directions to the T.