Well, I've got a 3000psi unit that I bought primarily to clean the concrete tile roof (weird ain't it), the lanai, and driveway. The 3000 psi is fully adjustable down to something like a thousand or so which makes it good for cleaning the boat, dock, and other light jobs. I would spend the extra few bucks and get a HD gasoline powered washer. You will then be able to blast away at whatever you want.
