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Author Message   John_s Tinkerer Username: John_s Post Number: 106 Registered: 07-2009 Rating: N/A Votes: 0 Posted on Thursday, December 13, 2012 - 08:31 am:    I have cleaned the rear surface of box camera lenses by opening the shutter on the T or B position, then poking a cotton bud (Q Tip) through the opening at the rear, and clean he lens using a circular/ twisting motion. Use lens fluid if necessary, and it helps to tease out the end of the Q-tip somewhat.