This stuff is the best example I can think of, and a rare one, of a product that not only works but far exceeded my expectations. As one reviewer mentioned, it will cause wintertime ice to easily flake off. Ditto for summertime bug removal. It repels rain so well that it is a viable alternative to doing an expensive windshield wiper mechanism repair (for those of us that drive old cars). I work as a highway patrolman (er . . patrolperson) for a living, and quickly learned that windshield wipers tend to lift off of the windshield when when having to drive at 80-90+. No problem with Rain-X as this is where it works best -- aided by the wind to blow your windshield clear. MANY TIMES I have driven to an emergency call at high speed, in blinding downpour rain, with my wipers turned off and seeing perfectly (and enjoying my coffee), while other traffic is stopped on the shoulder or crowded in under bridge overpasses (I still can't figure out the purpose of that) due to no visibility. And I find that it lasts for several weeks on a car that is not garaged. My highest recommendation. Three thumbs up! Oops - make that two thumbs up.