Don't know if this is the best forum for this question,but...I have heard totally contradicting advice re: power washing a vinyl sided house. I want to power wash my vinyl sided house becuse it looks dirty.My research has found all advice from "don't ever do it--it will rot your house out",to "go ahead,why not" So,any help here? Or is there a better forum?? Thanks ever so much.

While I'm at it what's the concensus on power washing roofs? have heard that often makes a roof look new.There's no obvious damage to roof and really shouldn't need replacing,just looks faded and streaky. Thanks again,jardinista