I've been an avid Rain X user for well over ten years with no ill effect. In fact, not only have I used it on my F250 King Ranch, two BMW M3s, Pantera GTS, and WK2 Summit, but I use it on my Polaris Ranger XP LE as well. I also use it on my shower glass door to help shed the water as well. I've never had any issues with my automatic windshield wipers. I've found that it does take the use of a clean microfiber cloth to apply and then a second clean and dry microfiber cloth to remove the haze and streaks. In fact, I put a fresh coat on both the front and rear windshields yesterday on the WK2 when I detailed it.
I've also used Bon Ami periodically to get a truly clean surface prior to cleaning and then finally applying the Rain X.
Agreed, I've used it for many years on many different vehicles without a smearing/streaking problem......and trust me I'm picky....I use to work @ a detail shop in my younger years and windows were always the thing that customers noticed so they had to be perfect.
Anyone have any tricks for getting spots off you can only see while the window is wet? I've tried soapy water and various other things, but when I wet the window, I see all kinds of spots and stuff. They sort of disappear when dry.
If Bon Ami won't do it try the AutoGlym glass cleaner - have used it for years and it seems to work. Regarding Rain-X the posts here are correct about proper application. The removal of the haze is very important. I used a damp cloth after the application and it worked perfectly - micro fiber might even be better. You may feel like you are removing the product but you aren't. Follow the instructions. I can still see a little haze from the Aquapel on my MB windshield in sunlight after 6 months so think I prefer the Rain-X. Do the Bon Ami or AutoGlym type product first.
It's called google, there are plenty of research and tests between the two. The main difference is no residue with aqualpel and it lasts for over a year using wipers. Go to any glass company and they only recommend aqualpel.
__________________ Current: 2011 GC Overland 4X4 Mineral Grey, HEMI