There have been a lot of great answers for how to clean shower glass but I'm concerned about how some of these suggested cleaning agents will react with rubber and auto paint. So I want to ask what people have found effective and safe for getting rid of hard water stains on auto glass. Thanks.
I live in Hawaii and used a product called MX-7 (for glass) on an old truck that had years of hard water spot buildup on all the exterior glass. It took the hard water spots off with little elbow grease. When my son bought a place in Las Vegas a year ago, I looked all over the valley for this product but couldn't find it. I finally found it at one of the local hardware stores (Ace). They just started carrying it.
Try a can or two of Coca-Cola poured directly over the windshield. Wash the car afterwards just to be safe. I have done this several times to no adverse effects.
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