If you talking about "water spots" that are white. It most likely is due to hard water. Water is termed "hard" when it contains excessive amounts of calcium. It generally leaves a calcium deposit (so to speak) as it dries. You could get some of that CLR stuff and use it since it is on your window. I'm not sure, but I'd imagine that CLR is a form of acid, and should get rid of the calcium. DO NOT USE IT ON PAINT! I hope that was clear.is2scooby said:Are you talking about the rather large (ping-pong or golf-ball sized) geometric pattern of white translucent dots in the rear window?