My search is as follows: Haven't call any of them yet but many of you wanted to know my responses... Jim Strapple 412-583-4700 OBHI 412-805-5602 Derek Werderitch via HP listserve but cautioned to wait until night temps are above 50 degrees because of surface tachiness....very helpful info.... Hill Jordan, Has a groundskeeping service and charges 30$/hr for powerwashing services.....don't know about the staining thing....412-758-7235 Lives on Jackson... So there you go...Good Luck out there.... Linda