I am looking into a pressure washer. I will be using it for my deck and vinyl siding and some stone walls that like to get green from time to time. My deck is about 8 years old and other than the grime that built up, it is solid and sturdy. It is built from Pressure treated lumber. How many PSI is good and what brand? Will a sears one @ 2800 PSI work? Is 2000 psi too low? Thanks for any info