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I do mine about every 6 months. I live 50 metres from a salt water lake and the air is very corrosive. I basically "rinse" the mirror with luke warm water, then use a spray bottle with a very dilute solution of PH neutral dish detergent and then do a final rinse on the mirror with distilled water. I avoid touching the surface of the mirror if possible. I usually use pure cotton wool about every 3rd or 4th rinse. If you rinse it regularly the crud comes off a lot easier and you don't need to use cotton or touch the face of the mirror very often.
Cheers,
John B
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