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Author Message   Petercat Tinkerer Username: Petercat Post Number: 12 Registered: 01-2007 Rating: N/A Votes: 0 Posted on Sunday, September 02, 2007 - 04:59 pm:    As an alternative, I have used an ultrasonic cleaner (normally used for jewelry) with the cleaning powder supplied to clean removable focusing screens. After cleaning, dump out the solution and refill with distilled water (no residue!) and run it through again, then let it air-dry overnight. I bought my unit at Harbor Freight for less than $50.00 (it's perfect for cleaning eyeglasses!), and it really comes in handy. Or you might take your screen to a jeweler...