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Blast lens with Dust Off to remove any grit
Brand name Kleenex (plain white, no aloe or additives!)
Brand name Windex (spray on to tissue, not the lens) for water soluble marks
Acetone for everything else. (again, applied to tissue first)
Acetone may leave an evaporation mark, but If you have a second (dry) tissue, a quick second wipe will avoid these.
One wipe=one tissue. Tissues are cheap, lenses generally aren't!
Any debris from the tissue then removed with a can of Dust Off or similar.
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