My Chinon 10x25R binoculars have the same problem.
Simple use soft lint free cloth like old drying up cloth, you need about half a cup of methalayted spirits,can get this from any hardware store.
poke finger into cloth dip into meths proceed to rub sticky coating off binoculars. you will need to keep changing to a new peace of the cloth as soon as it gets coated with the sticky black stuff off binoculars.
keep dipping into meths eventually after say 6 rubs in a particular area you will see and feel a nice hard black plastic, continue all over effected area then finish off with any window cleaner polish until cloth remains clean.STICKY COATING IS NOW GONE IT WAS INFACT A COATING PUT ON THE BINOCULARS TO MAKE THEM NONE SLIP. job done. regards GER8
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