No Touch Auto Glass Stripper (Click Me)

Works great, takes off anything including hard water spots (works great on shower doors in the house too )

I follow it up with 2 coats of Rain-X - the Stripper really gives a good base for the Rain-X. Lasts forever...

Rain-X keeps the windows "slippery" - dirt just wipes off, rain slides off - at highway speed you don't need to use your wipers. At practically any speed you don't need to use your wipers if you have a good coat...