So, here's what I learned from the guy at Saf-T Auto Glass, when he replaced my old windshield several years ago.
He said never EVER use any water-based liquid, or let anyone else use any water-based liquid, on the inside of your windshield. The second you do that, is the second you're doomed to have film form on your windshield until you replace it with a new one. You might not have film for a couple of years, and one day you'll notice the glare when you turn the corner at dusk.
The ONLY way to get rid of it is with a DRY cloth, with NO chemicals of any kind on it. You wipe it away with a polishing action - basically buffing it out. Find a detailer who understands this.
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