Hi Wol
Dust is pretty hard to avoid..I use canned airbrush to first remove the loose dust..then very carefully use a camelhair brush followed by another blast of air...as for anything like a fingermark..a tip of a rolled up tissue dampened with isopropy alcohol and using the weigth of the tissue only move it side to side across the lens...repeat with a clean tissue until the marks are cleaned..any residue can be removed witha "lenspen" then with a final blast of air.
Maybe camera stores have anti-static cleaner...otherwise it would not be a good idea to pull your eyepieces apart unless you're in a cleanroom using sterile equipment and attired like surgeon, mask and all!!
Cheers!
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