When i went to Wiruna the first time i got a coating of frost on my primary that dried into this awful crust. My views were rubbish for months until i researched how to clean the mirror. The first time i did it i was freaking out that i would scratch the mirror. Being gentle and thorough thou there were no issues. Suffice it to say that the views were a million times better. I have cleaned my mirror a couple of times since then and the more i do it the more confident i am. Even with a small coating of dust there is a massive difference in viewing capabilities.
So long as you are gentle and methodical there should be no issue cleaning it.
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