You tried both inside and outside of the glass, right? Can you clean it off with a damp rag maybe? I’m a bit baffled by this and grasping at straws here.
I woul have to agree with @griss thought process either excess silicone or just a water mark. It could be a calcium build up. If that’s the case, it is likely on the outside (should show under water) and a little vinegar and water should help get rid of it or the use of a razor blade to scrape it off
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