Well, that was the other day I took my rolleiflex 3.5 to the snow storm. A pretty big storm --- that the focus screen were covered by the snow. Eventually they melt in the subway. How to clean this... I ended up taking the top off, clean the screen both sides. Also I cleaned the lens for the moisture due to the warm room. I am even thinking of taking the whole thing apart... Is there a service manual I can find on the web? Thanks.