Does anyone clean their own windows? What have you used to get built-up film off? I know you can find suggestions for a mixture of vinegar & water plus dawn dish soap. It's the same thing I use to clean my shower glass. It does not seem to be doing a thing to break down the film coating some of my windows, though. I'm sure the fact that it's warm out and dries really fast is not helping. Anybody have any suggestions on cleaners they've had success with (homemade or store bought)?