I heard your uninformed comment about Rain-X a few weeks ago and am just getting around to commenting on it. You basically panned the product, saying it merely smeared your windshield. If you do a simple search about this problem, you’ll find that many have had the same problem. OK, but the solution is very simple. READ THE DIRECTIONS!!!
If you do, you will see that you have to first clean and dry the windshield thoroughly. I clean it with 50/50 alcohol/water mixture and dry it with a paper towel. Now, when you apply the stuff, spray it onto a paper towel and spread it evenly until it dries a little. Do just a small section at a time. Then go over the whole windshield with a little more, trying to produce a uniform coat. This stuff is basically a polymer-based wax, similar to car wax. Once you get a nice even coat you have to buff it just like you do car wax. This is the key to avoiding the smear problem. I just use a clean dry paper towel. Keep buffing vigorously until the coat is clear and slick. No streaks. It will squeak when it is polished correctly. This does require a little bit of elbow grease but it is worth it. That’s it. Now it will repel water like you won’t believe and it won’t be smeared by the windshield wipers.
Another little trick is to use the Rain-X De-Icer instead of your usual washer fluid. It is quite reasonably priced at Walmart, etc. Every time you use it, it applies a fresh coat of Rain-X, thus prolonging the protection much longer than it would normally last before a new application is needed.
I think you guys should try this and re-evaluate the product just for your own heads if nothing else. You may be surprised.
BTW, I am not in any way affiliated with this product. I am a satisfied user only and I like to propagate ACCURATE information.