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Due to my environment, and the haze that builds up on my mirror, I clean it every 3-4 months. Going longer results in a noticeable loss of brightness and contrast. When I clean the mirror, and make a swipe across the wet mirror, then rinse it off, there is always a shiny streak in an otherwise dull surface.
For my scope, that's one cleaning about every 40-50 hours of use. I couldn't answer the poll because my answer wasn't there.
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