A good average time between cleanings is about 18 months. Depends upon conditions, but remember the old saw: A dirty mirror performs better than a clean one!
Mainly because everytime you clean your mirror you run the risk of damaging it and actually you do anyway. Just be careful, take your time, don't forget to clean out whatever you are washing your mirror in, and pad the bottom of the container with something soft (old teatowel). Words to remember: Minimise the risk!
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