WOW. such sarcasm in one of the answers. Yes it's glass...but not all glass is treated the same. Some glass needs to have special cleaners used on it, because of other treatments that the glass has. In particular, tinted windows. Certain "glass" cleaners will turn tinted glass purple. Now I realize this is because of the coating that is applied to the glass to tint it. BUT, I can also understand the validity of someone asking a specific question, worried about the possibility of screwing it up. No need to be rude in our answers.