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I can tell you that most major automotive glass companies recommend Bon-Ami Cleanser. Do not use any other brand since they will scratch the glass. I worked for a school system that had many school buses and Bon-Ami is what that was used to clean anything off the windshields. Bon-Ami has many other uses. I know Bon-Ami works since I use it my self. There are many home remedies like a bag full of tobacco or pour a coke on the windshield but Bon-Ami is 100% effective. More tips on car care can be found by clicking here.
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