How do I get hard water stains off my car window and windshield?

I have had a sprinkler system and hot sun hit my car for weeks. I, through research and a lot of elbow grease, have managed to get the calcium stains off my black paint, but am having problems getting the circular hard water stains off of my windows and windshield. I have tried vinger based products, CLR, newspaper buffing, and other methods. I am wary about using a #0000 pad because I am afraid that I might scratch the glass. Any thoughts and suggestions would be welcome.

How do I get hard water stains off my car window and windshield?
it's very possible that the sun has etched the water into the glass and you will end up replacing the windshield but before you do that try 000 steel wool to take them out, if it doesn't take them out nothing will, and don't be afraid of it scratching your glass as I have used it for years on glass and chrome on old cars and have never yet scratched glass or chrome.
Reply:Vinegar and water 50/50 and an old T-Shirt.





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Keep in mind it's not instant, you may have to rub a little and let the acid in the vinegar to break down the lime/calcium.
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Reply:White vinegar.... the cheapest and easiest way to remove hard water stains..... I mix half a bottle of vinegar to glass pluss and im good to go....perfect cleaner.
Reply:windex, and actually bug and tar remover works well but it leaves swirl marks, so use windex after the bug and tar remover
Reply:I know for road film, you can pour a Coke or Pepsi on the windshield. Pouring it over the windshield cuts through the film. I'd have a hose handy to rinse off. If you want to try this, might think about putting the cola in a bucket with a soft rag, and just wipe it over the glass. Then rinse it, well, and dry off, if you don't want to get it on the paint. It's for windshields only as far as I know. I've used this method for tough road film that won't come off of the window. You don't have anything to lose as long as you rinse it well and dry to a shine. Worth trying I would say.