After washing the Chevelle the other day outside. I got most of the water off of her. But we had to run some place and come back in about an hour. So I never really got back to her. So yesterday while waxing her. I noticed my back glass and side windows were water spotted all to hell. Since I was using the clay bar on her. i tried it on the glass also!!  To my surprise the windows came out spotless and very smooth. Worked so well I tried it on her Cobalt also. Man It works like a charm.