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I do the occasional viewing at the local Primary school...sometimes the odd fingermark winds up on the EP's lens which I clean promptly with canned air first then use the corner of a rolled-up tissue dampened with isopropyl alcohol and wipe the lens side-to-side using only the weight of the tissue itself...other than that...light cleaning is done with canned air or at most a lenspen...
Prior to any observing session I'd buy a couple of boxes of tissues and ask everyone to wipe their eyelashes and asking them not to touch anything...using EP's with long eye relief and shining a red light on the EP so people won't smack their eye on it does help!!!...and of course give the outer body of the EP a wipe afterwards ready for the next session.
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