Razors have been used by the window cleaning, glass, and construction industries for many years. Razors, won’t scratch uncoated glass when properly used. They have long been the tool of choice and most practical method for removal of debris such as paint, adhesives, and stickers on uncoated glass.
That being said, scratched tempered glass has become a crucial issue for the window cleaning industry. It has come to the attention of professional window cleaners and the glass fabrication industry that the cause of this problem is a microscopic glass defect called fabricating debris.
Fabricating debris are made up of tiny glass chips and dust that get baked onto the surface of some tempered glass. This is a quality control issue from the factory that may create scratches during the window cleaning process. It is important to test the glass for fabricating debris prior to installation or choose a fabricator that checks for fines as part of their quality control program.