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Dennis
I had a few stubborn spots on my DMK that would not blow off. I went to my local astro/photographic store and got a 12ml bottle of optic cleaner and a cloth. I wet the cloth with the optic cleaner and wrapped the cloth over a q-tip, then wiped gently in one direction.
Take some flat frames first to compare before and after to make sure you get it satisfactorily clean. It took me two goes but it came up very good.
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