Wow, what a difference. I have been cleaning my patio several times a year with our home pressure washer. I could never get it looking as clean as I would have liked so called in Great Outdoors. Mike was very polite in explaining that a DIY pressure washer only does part of the job. He then set about our patio with his very impressive pressure washing equipment. The result was a patio that looked very much like the day it was first laid. Fantastic job and will be getting you guys in to do a Spring clean on it every year.