'18 and '19 Crosstrek Limiteds
If you read my original post in this thread, I'm not actually making a judgment on Rain-X. You may or may not be right. What I'm questioning is the logic employed here and in lots of other threads when folks have stuck cameras or GPS units on the dash, or bug deflectors or lights on the hood and say that because Eyesight hasn't shut off or complained that it must be working perfectly. I don't believe that's case. Even if Eyesight has only been degraded by a small amount, it could make the difference between hitting something (or someone) or not. As has also been pointed out, there's probably an aspect of Subaru covering all the bases to avoid liability. I just don't think it's accurate to tell someone asking for advice that because active cruise control still works, everything is fine.I've used Rain-x for years. After reading some of the above responses, I believe this simple question has been blown out of proportion. If you apply Rain-x treatment, you have to buff it after it has dried. Just like wax. As far as affecting the Eyesight function, a dirty windshield would probably cause more problems than Rain-x.
I wasn't able to read the article that @Chuckster posted, as I don't subscribe to the WSJ, but I've seen similar ones.