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Some of that patchy look on the surface of the mirror maybe due to mold. Sometimes mold can look like dust, and it may have been the case here. You'd expect any damage that may have been done by lens cleaner to be more streaky in appearance. But if you wiped it over with lens cleaner and a soft cloth, any of the mold growing on the surface would lift some of the surface coating with it. Or at least show where it was eating into the surface of the mirror.
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