hi guys,
@Deniz: hmm, it will contain aceton wich is very harmfull for rubber. i think it would be dangerous for the rubber used in the watch.
@Lani: well, at first i thought it was indeed dirty or greasy and tried to clean it with some wother and a very soft cloth (to clean camera lenses) but it didn't work. the coating is surely coming off I don't really need this coating and would be happy without it but now it just looks ugly and not properly used