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Here's another test to try..have the optical tube horizontal remove the dustcap and look at the primary mirror...if it looks clean..then leave it...and if it's looks dusty or has a few tiny smudges...leave it for 6-12 months and then look again...if it hasn't changed much..then leave it for another 6-12 months...your images won't be greatly affected by the amount of dust that would cover a tenth of the area of the centre spotting ring on the primary mirror spread over the surface of the mirror itself!
Relax and enjoy the views!!
Cheers!
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