[jyl]

Seems topical . . .

I’d like something to coat or treat my windshield so that raindrops simply glide away, without need for wipers.

Rain-X is the obvious answer, and I have three bottles of it here, all barely used, which evidence that I apparently don’t find it good enough to actually use? My recollection is that it works, but not well enough to eliminate the use of wipers, which proceed to remove the Rain-X . . .

Maybe I’m using it wrong.

What about ceramic glass coatings? A freshly ceramic’d paint panel will shed water like a greased duck, maybe a windshield will be even better?