I have extremely hard water spots on every inch of glass on my 2007 Ford Mustang. I've tried everything from 100% Vinegar mixtures to vinegar with baking soda to even muriatic acid and nothing seems to work or even put a dent in the spots. I'm not the first owner of this car and these hard water spots have been on the car for years. A razor blade helps a little bit but the process is too tedious and does not work well at all. Does anyone have any tricks that would help with my problem?