Rain-x followup question?

I have had very mixed results with Rain-X. At best, it works well to keep rain, snow, and ice from sticking to the windshield. In high humidity it can make the outside of the windshield foggy. At worst it can permanently ruin visibility through the windshield. That happened to me when I used Mr. Clean no-dry car wash liquid after applying Rain-X to the windshield. It rained that very afternoon and when we ran the wipers it was exactly like the wipers were spreading white paint on the windshield. Of course, detergent does not remove Rain-X and we had to wait out the storm. I polished the windshield with Soft Scrub for an hour or so and that reduced the effect to the point where we could drive in the rain. Mercifully, less than a year later a rock cracked the windshield and we finally had our visibility back when the windshield was replaced.