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Try vinegar! Apply it gentry with a mildly abraisive applicator, like maybe one of those makeup sponges out of a woman's compact (oops!, I mean, I have no intimate details of such things.) Anything like that just gently applied with vinegar in a swirling motion can be pretty effective on water spots. Good luck!
Some guy's use 0000 steel wool (super fine) and keep the window wet with your glass cleaner and rub lightly. Or www. eastwood.com and they sell a kit to polish your windows. It's a round felt pad that goes in your drill chuck then you wet it down and use their cleaning compound and it comes out crystal clear. Pipe
........i USED to have the problem on the front windshield that the wipers would not touch...i used bon-ami (or bar keepers friend) cleanser and one of those sponges with the slightly rough surface on the one side.......i wet the glass, applied the clenser, and used the rough side with a steady but rather hard down pressure and it worked fine.........i did try vinegar because the marks seem to be by hard water but, it did little if any.......after that, i applied rain-x......
Some guy's use 0000 steel wool (super fine) and keep the window wet with your glass cleaner and rub lightly. Or www. eastwood.com and they sell a kit to polish your windows. It's a round felt pad that goes in your drill chuck then you wet it down and use their cleaning compound and it comes out crystal clear. Pipe
This is what body shops use to get overspray off of glass as well (super fine steel wool , that is)
My son found a product packaged and sold in my area called 'Stain Bully'. It would be found in the same section as Tile-X and the like in stores. Takes water spots off glass in seconds flat leaving it looking like brand new. Don't know if it's harmful to paint or not. Haven't conducted that experiment yet, but it sure works on glass.
The active ingredient appears to be something called ammonium bifluoride. Don't know how nasty the stuff is but I'd sure recommend wearing chemical resistant gloves and work up wind while using it. Something that works this well can't be good for you.