Marc acetone (propanone) should be OK. It is a good solvent and cleans well. It should not affect the Al mirror surface or the glass but I would check on the coatings. I suspect these would be reasonably inert in any case. As has been mentioned it can dissolve some types of plastics so contact should be avoided. I wonder how diethyl ether would go? Might try that out on an old mirror.
Mark
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