We use a solution of about 10 parts distilled (or deionized) water to 1 part pure ammonia to clean car windows. Works better than the "other" window cleaning spray. I've wiped the windshield twice and it's so clean that when it's raining, the fog barely settles on the inside of the window. And if it does, the de-icer blows it away immediately! Just try to stop it from dripping and sit on the vinyl backing.
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