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I started with a crappy EP I never used and experimented, putting my greasy fingers on it and then using different methods to clean it. Surgical cotton wool is my choice now, with it all fluffed up you get a shock absorbing benefit too. But at the end of the day they are only eyepieces and no doubt the coatings are designed for regular cleaning. I'm just very very careful there is no grit on them before I wipe with any pressure. A scratch would be nasty.
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