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Author Message   Brcamera Tinkerer Username: Brcamera Post Number: 48 Registered: 08-2010 Rating: N/A Votes: 0 Posted on Sunday, October 17, 2010 - 09:54 am:    If your fresnel screen has damage on it from the mirror box foam it would be very difficult to clean it without damage to the fresnel screen itself. In your case, it would probably be best to just replace the screen. You will have to remove the prism as the screen comes out through the top, not the mirror box...