Most RFs have tops that can be rather easily removed: a few screws and the film advance lever (usually the top turns counterclockwise to unloosen). If you get the top off, take a very clean, soft bit of tissue, moistened with a bit of glass cleaner (no alcohol), and, using a tiny screwdriver or forceps, gently moisten all the inner and outer areas of the entire VF glass. (Warning: if you use alcohol, you will remove the coating on the 45 degree reflective/transparent glass needed for focusing). I have never had trouble using even plain water with a tiny drop of dish liquid in a full cup. Make sure to completely dry everything as this procedure is delicate and dust can easily settle. Blow out any lingering dust. Make sure to also clean the top while it is off, both inside and outside. -David Lyga