I haven't had good luck with Rain-X windshield cleaner on my Z's windshield -- but perhaps you meant regular old Rain-X not the cleaner. I find that to get that super slick windshield feeling I use a very light "scratch X" compound -- Scratch Doctor by Nu Finish works well -- at least it's good for something since it doesn't actually remove any scratches on the car's finish. You probably won't want to do this too often, but a good buffing once to remove all the new window residue probably won't hurt it.
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2010 Platinum Graphite 370z Roadster:Touring/Sport
2013 Subaru BRZ Limited
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