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As a general rule, you shouldn't seal up any optics that are damp, including caps on eyepieces etc.
As for the mirror, there are countless threads on this site re cleaning mirrors already and the search function will see you right.
i would start with a rinse under a lukewarm tap to wash away any loose or water soluble crud before a soak in a lukewarm bath with a tiny bit of dishwashing detergent, followed by another rinse of running water, followed by a final rinse of distilled water.
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