I have a cag scope that was cloudy from evaporated grease. I took the objective and the ocular lenses off and it cleaned them off both inside and out. It helped immensely. It's not a terribly difficult task if you are patient and are careful.
I have a ZF41 with the same 'cloudy' issue. I tried taking it apart, but things are stuck and I don't want to gorilla it. Looking for someone who can make it better...