I had a azek deck installed. There were a few scuff marks on the deck that I could not get out. Azek sent out a tech. to resolve the problem,at no cost to me. David F used deck max on my deck. I am very happy with the beautiful luster that my deck know has because of this product.This product is great. I plan on purchasing this product so I can clean it myself. It is very easy to do. I want to thank David F. he did a great job on the deck with this product and also he took the time to educate me on cleaning the deck my self.