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You could try absorbing the cleaning solution off the lens with a folded Kleenex tissue before it dries; when I clean with isopropyl I notice some of the solvent/oil mixture remains on the lens unless it is cleaned repeatedly or absorbed before it dries.
If the objective hasn't been cleaned for some time there may be water soluble contaminants on the lens in which case you need to also clean with distilled water and absorb the droplets off the lens before they dry.
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