Storage of enlarger lenses is an issue. I have a few Componon's and used to leave them on the enlargers, that's fine if they get constant use and it's relatively warm.
Originally Posted by Tom Kershaw
Moisture gets inside and as they warm up through use you get a thin film of condensation on the glass, over time this leaves a film on the inner element surfaces. This is probably the haze you describe. I've managed to clean my affected lenses as the elements unscrewed easily and a very careful wipe clean with glass cleaning fluid left them as new again.
Now I remove the lenses from the enlargers and store in a different dry warm room, (my darkroom is in my cellar). The problem was worst when I used a darkroom attached to the back of the house with no heating.