I'm not adverse to elbow grease, Rain-X is like Zaino, just smears, no matter how much pressure you use, how long you wait, or the the temperature you apply Rain-X. I like Silbead, worked great. I say "worked" because they no longer manufacture it (at least I can't find it). I have used Dr. Beasley's (
http://www.drbeasleys.com/glass-waxx.html). results better than Rain-X but not equal to Silbead. I now use Aquapel
http://www.aquapel.com/ still comes in 2nd to Silbead, but very good. Rain-X windshield washer solvent(orange) clearly the best solvent I have ever used, great cleaning off salty windows. Rain-X in the yellow bottle, not good. Still looking for something as good, if not better than Silbead.