ONE GRAND PASTE GLASS CLEANER cleans and polishes glass, removes hard water spots and acid rain fallout. This product is exceptional at removing hard water spots from glass, we can not overstate this fact. It is important to note that PASTE GLASS CLEANER is only intended for use on glass and is not intended for use on plastic windows, head lamp covers, lens covers, taillight covers, bug deflectors, tint film on windows or painted surfaces.