I have Moisture Shield composite decking, I installed it about 7 years ago. I have had a mold and mildew problem and tried several suggested cleaners from the Moisture Shield website with absolutely no success. I ran accross Corte Clean on the internet so I called customer service and asked questions, I found them to be very helpful and they went out of their to ensure I understood their product. I then ordered Corte Clean, when it arrived I followed the directions for use exactly as described, I even watched their video. This product is absolutely amazing!! It removed all mold, mildew, grease, and stains. It looks like new!! I shared this with my friend who also has Moisture Shield he got the same results. After this experience I will only use Corte Clean. It is really refreshing to get a product that does what it claims.