Just retinted a 2004 Corvette. Used a plastic scrubby pad to scrub very little glue that was left on back glass. Didn't notice it when i was tinting it but it came back and there was scratched all over. Needless to say i'm replacing the glass now and it cost $3,400. I talked to the body man that is replacing it and he said that the glass is not made of glass. He said that it will scratch very easy. Wish i would have known that before.