 you're much better off than trying to sand it out or pressure wash it out. Because think about this. The pressure washer is infusing water. If you're using something like, I don't know, a 3,000 PSI pressure washer, which is not abnormal to have in a home, a home garage or something along those lines, and you use a 25-degree tip on that, that's a lot of force. It'll clean your deck all right.