Answer (1 of 10): There is a Prestone brand spray you can buy at Wal-Mart that works great on frost. For thicker ice you really need to turn your windshield defroster on high fan, max temp and wait at least 10 minutes. Then it will be much easier to remove the ice. Yeah this may make you late for
Driver's 'amazing trick' will keep ice and fog off windshield for up to 3 months in winter - it just costs less than $4
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