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Old 29-09-2020, 04:35 AM
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Don Pensack
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Don Pensack is offline
Join Date: Aug 2006
Location: Los Angeles
Posts: 426
Pure alcohol should work fine. Be gentle on the inside surface, as the coatings are likely on that surface.
But you need to make certain you do not, ever, rub a dry surface or a surface with dust on it.
They're not THAT delicate, but more delicate than eyepieces. More like primary mirrors.
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