I had several cameras that were collectable rather than users stored in sealed plastic containers with silica gel. After a couple of years I opened them to find that all the leather cases were wearing fur overcoats. Nothing seemed to have affected the lenses though, and a quick wipe over seemed all that was necessary. The camera repairer I used recommended storing cameras and lenses in glass-fronted cabinets. I don't have room for that, so they live in a drawer, on the sofa, on the table, in the car, on the hi-fi .... you get the picture...
Steve :-)