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I gave up on RainX in the ‘80’s, because it leaves a smeary, prismatic sheen that looked to my eye like grease and defies wiping away, and worse leaves the trail of where you just wiped behind. Yes the water beading action is really great, but I don’t like greasy looking smudges on my car windshield.
That’s said, you can actually get a similar hydrophobic effect just by intensively cleaning the glass using a windshield clay bar the same way you would use a paint cleaning clay bar. I had a video somewhere where I rest a bottle of instant detailer on my car’s windshield which is pretty sloped. The bottle stays put from friction from microscopic dirt on the glass, even though the glass is quite clean from car washing and wiping down. Then I use the glass cleaning clay. Without applying any chemical coating afterwards, the bottle slides ride off the windshield if I try to rest it on it and it’s impossible to get it to stay put. Water beads up also and tends to blow off from the airstream if you are going fast enough.
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