I use a 2300psi 2.2 gpm washer. My boat is still new so there is not much paint builtup on it. I use Interlux ACT paint. and the washer blows most of it off leaving the origanal hard paint. If you are going to buy one wait until mid winter when Home Depot has big sale on refurbished washers. The one I bought was hardly used. It did not have a spray handle so I bought one for it for $90. The washer it self was $90 also. The origalal washer price was $369.