Atferrari, Is more like moving apart. Now I think the problem looks like is the optic system. The problem which I met is no matter how much I clean, on the mirror will remain some hues, is not dirt but something from liquid which dried. I clean with
cloth after but I see it just moved from one side to other.
Those mirrors are most likely first surface type where the reflective surface is on top of the glass instead of the underside like a bathroom mirror. You mave have scratched the reflective surface.