The last job yesterday, I noticed, all too late, that the idiot had smeared Vaseline or something round the frames. I forgot all about it by this morning, but knew something wasn't quite right, then cleaning a window in the sun It looked as if the brush was leaving scratches! It eventually dawned on me and have been since cleaning the brush between jobs with cream cleaner, still don't know if I've sorted it, but is now soaking in a bucket of soapy water. I tell you, it a real confidence knocker. Anyone else suffered this, and is there a best way too get it off?