I've just gone through another rainy day driving surface streets. I treated my windshield with Rain Clear(what a pain) and Klasse SG, right half was Rain Clear. I was going 40 and the rain was that light, irritating rain but it wasn't beading fast enough, I couldn't see, the cones for the contra flow lane were messed up and long story short, I smacked into a sign post I didn't see until too late. Scratched my side mirror paint. I'm going back to Rain-X. There is simply no comparison. The Rain Clear and Rain-X look the same when the car is sitting still but the Rain-X beads the water off a moving car at a much lower speed(30-35 MPH). I usually apply it twice with the following method:
1)Wipe glass with paper towel and Rain-X
2)Stream on Rain-X from bottle directly on glass and wipe until hazy with paper towel
3)Allow to sit for 10-15 minutes or overnight if I have time
4)Wipe with microfiber towel
5)Repeat steps 2-4
Thank god for MF, I used to try taking it off with just paper towels, what a nightmare.
I've also tried that No-Touch stuff and can attest their products are a waste of money.