There are many products out there, which claim to be effective composite deck cleaners. However, Corte Clean is the only one that does the job each and every time. I switched to Corte Clean three years ago and will only use this product. Keep in mind, the directions must be followed, exactly as they are written. Do this, and you will be as happy and loyal a customer as I am. The other thing is, often when I phone Corte Clean to place an order, the owner answers the phone and takes the order. Can't beat free shipping, either. I give Corte Clean my highest possible rating and recommendation and would never even consider trying another product.