Corte Clean is a miracle!! I’m serious!! I live in New Hampshire and my trex deck was covered with black mold that was discovered when the snow melted. While the cleaning was a little time consuming, as we followed the directions/steps to a T, it was definitely worth it!! My husband and I could not believe the results when the deck dried. The stains were gone!!! This home is new to us and was glad to get a postcard in the mail addressed to the previous owners that advised it may be time to order some Corte Clean. I would’ve never known what to use to remove the stains. It’s an awesome product and would recommend it hands down!