REcent Glass purchase
I recently purchased a 3/8" 14" round tabletop, there was a 2 1/;2" round marking on the glass which I could not remove with either vinegar, soft scrub, alcohol, etc.
I called and it was suggested that it appeared to be a marking from a glass, however it was the way I received it. It appeared to be etched into the glass. My thinking is that it may have been a scratch from the rubber suction cups used to handle the glass. I have purchased previously and never had a problem>