Since there was still too much glue residue on the mirror, I used another reflector cleaning trick and soaked some medical gauze in acetone and dragged it over a corner of the mirror. It started removing the glue without harming the mirror! I repeated several times until the glue reside seemed to be gone, washed the whole mirror with acetone and a pressureless drag of the gauze, then over to the sink for a couple alcohol and distilled water washes.

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