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I used to use glycerin, but m'darlin' is a staunch believer in Rain-Ex and I'm down with her…
Before every trip she sluices down the windshield and rear window with the stuff, and it freakin' works! We were on the Maine Turnpike four nights back in a minor monsoon, and didn't even have the wipers on!
I use it on my lenses now as well.
