The wife just had the house windows cleaned. The guy said he would clean the water spots of the lower windows. Light goes on. Bus windows. So I asked him if it would work on my mineral spots on the bus glass. Yes. He used a product called Bio Clean and a lot of elbow grease or PEG (plenty of elbow grease) Now my bus windows look like new.

http://www.perfectproductsonline.com/bioclean.html

GregM