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Author Message   Hanskerensky Tinkerer Username: Hanskerensky Post Number: 160 Registered: 05-2009 Rating: N/A Votes: 0 Posted on Tuesday, January 24, 2012 - 11:55 pm:    I have seen oil penetrating lenses before but in your case it's very unusual that the oil looks so clear. It's often giving a discoloration. Good that you can get rid of it so easily !