After successfully using Corte-Clean on my Trex decking at home, I wanted to use it on the permanent dock at our cottage. Not sure if this would contaminate the lake I called your company and left a message with Greg. Hoping to get a call back within a few days, I was very pleasently surprised when he called back within 15 minutes. Greg was very helpful and answered all my quesitons. I look forward to having a a new looking deck at our cottage just like the one at home! Thanks! J. Meister PS – It did not hurt any of the grass or plants around my deck at my house!