I'm a bit obsessive-compulsive about removing stickers, so every time I have to change one of NY's several extra-sticky windshield permits, it reminds me of how much joy Sticker Shield brings. Instead of applying the sticker to the windshield, apply it to one side of a Sticker Shield and trim to fit. The other side of the Sticker Shield is a low tack adhesive that stays very firmly in place, but easily peels off without need for a razor blade nor for a healthy application of Goo Gone.
Sometimes the best solutions are the simplest ones and that's certainly the case with Sticker Shield. Buy two 4"x6" sheets for $5.50 from the Sticker Shield site.