I think that it's pitted. I'm going to check that thread.Is the glass pitted? If not, then something is stuck to it and you can get it off. I would use a single edge razorblade. If the glass is indeed pitted, only some kind of drastic buffing is going to reduce the visibility, but not eliminate it entirely. There was a thread earlier this week about the way to polish/buff out nicks in the glass. I don't remember the title at all. Maybe someone else does.