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Clean filtered water is probably the safest. But a pure alcohol will work better. Get 100%ethanol if you can. Iso-Propanol is OK but is has more % of heavier alcohols that will hang around after the propanol evaporates. I wouldn't recomend Turps or Metho for exactly this reason. Acetone is too harsh on plastics and will remove paint so I wouldn't use it because of the potential damage to the scope in the surrounding area.
Try water first.
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