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Cleaning bino lens would be the same as cleaning eyepieces..If it's only dust then blow off as much as you can..any dust remaining shouldn't affect the image...for a smear..dust off then use a tip of a rolled up tissue dipped in isopropyl alcohol and with the weight of the tissue only move the tip side-to-side across the lens..it also helps to wipe your eyelashes with a clean tissue to soak up any eyelash oil before viewing.
Cheers!
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