Well, I figured I better post this one over on safe ground where I will only get kidded a bit (unless this turns into a testy thread). I posted a couple of pictures of a damaged derailleur over on the BM forum. My old eyes aren't too good so I hadn't noticed how grungy the pulleys were until I looked at the high res photos -- whew, not pretty. So, to the subject question - is it reasonable to blow the crap out/off with a power washer or do I need to use a hand brush if I want to get this nice ultegra device lookin good? (The arrow is pointing to a problem area. It is the rest I need to clean.)