We spent the extra money to put in a pretty large Trex deck 2 years ago. I have had to clean the deck 3 times now due to the mold with the last time being less than a month ago. The mold is back again. I had contacted the company to see what to use to clean the deck and found the Corte Clean that was recommended. I was told that I should only have to clean it 2 times a year... what a joke. I am totally dissatisfied with the deck as it was sold to us with the claim that it would be low maintenance. I guess that only applies if you don't care what your deck looks like. I wish we had just kept our concrete patio.