I have a 5 year old Trex deck here in Florida. I used to buy Corte Clean at Lowe’s but now buy it direct, from its website. I have noticed that the fresher Corte Clean is, the better and faster it removes stains. The Best If Used By Date is incredibly important, and I get the freshest product when I order it from its website, unlike when I purchased it at the retailer. This saves me time. I have noticed that with proactive use, my deck stays clean for longer periods of time, so I proactively use this product four times per year. I don’t mind paying for products that work, and this one does, as I have tried other products. I just ordered more, as we received incredible amounts of rain with hurricane Irma and it is again time to clean my deck.