Weird spots on mirror AFTER cleaning

Hi. Just sprayed my big bathroom vanity mirror with windex and after I wiped everything off I have these big round spots and I can’t buff them off. What could it be? They are perfectly circular and maaaaybe exactly where I sprayed the windex? I’m not sure. Any idea what it is and more importantly how to clean them? When I first moved in there were two. I thought they were where the previous tenant had placed a suction cup holder of some sort but I just made about 5 more today!!

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