I've been using Corte Clean Deck Cleaner for five or more years, I've lost track. I use it in the spring after the pollen season to get the winter stains from the deck. I was first able to buy Corte Clean locally but now order it direct since no one carries it here. Corte Clean is the best product I have ever used to make my deck look like new. It really lifts the stains from my Trex and protects it for the rest of the season. The product requires thorough mixing or it will jam your Hudson-type sprayer. I've learned to use a paint stirrer that fits on a drill for best results. Be sure to keep the treated surface wet for at least 20 minutes for best results. I use a power sprayer to remove it although Trex recommends against this. I also treat an area larger than 10' x 10' but keep it damp especially in the sun. It works for me and makes the job go quicker. I highly recommend Corte Clean and will use it for years to come. Just wish I could buy it locally. However, shipment from the company was quick and timely.