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Ice,
I'll echo Mick's comments, and add to them.
I have cleaned the 10" mirror perhaps twice in about 6 - 7 years.
Mostly it is spider webs within the tube (I have a series of ring baffles throughout the length), that I have to chase away. As Mick says a bit of dust isn't bad, unless maybe it contains airborne contaminants?
Gary
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