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I use a big blower and then lens cleaning paper and a drop of lens cleaning fluid sold in photographic shops. If need be, I wrap the paper around an ear bud to get to an internal area.
As for cotton, I've read in several American articles that cotton balls and the like should be avoided, as when processed, little impurities can get into it.
What you describe certainly sounds like what I get on my short eye relief eyepieces when my eyelashes smear them. Strange it should be on your TMB.
Regards,
Renato
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