I would never.I watched a guy put long scratches in his car glass using a razor blade, must have had a burr or nick on it. Made me sick. Beware.
I need a water spot remover for the glass on our new Jetta. The windows are loaded with water spots and water won't bead during washings due to the water spot build up. What products are safe and effective to use? I see so many options.
000 (Triple Zero) steel wool takes it off great, and does not scratch glass. Just keep it away from paint and rubber trim.