Rain-X Anti-Fog spray is a defogging liquid that is only useful when applied to the inside of the glass. Make sure glass is clean before applying Rain-X products with help from an ASE-certified mechanic in this free video on car maintenance. Expert: Tom Brintzenhofe Bio: Tom Brintzenhofe has been a mechanic for more than 17 years. Filmmaker: Reel Media LLC

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I hate to say, but the fog is always the same stuff when I was 15 years ago; ineffective. He left an opaque film on windows that I have to wait a day to be in decent position to eliminate. Goes to waste.
I have 2 bottles of gel Streek got dull outside. I never thought that indoor use. Even the idea that Poland Extreme Clean. I think it is his “Polish Glass”, which was removed some years ago. Something like that is effective.
TOO MUCH flows. Any suggestions? I had to rub and rub and rub until no more can rub. I hate that part of polishing.