We had a deck installed with Trex Transcend (their top quality). We also live in north Idaho where we have many pine trees which produce a lot of green pollen. The grain is so deep in Trex Transcend that I cannot get the pollen out even using a brush. We used a different company (Azek) on other decks and they are really easy to clean. I wish I had never gotten Trex. What a hassle trying to clean it. We have had it for five years and I have NEVER been able to get it clean.