As the previous poster states, it'd be nice to know what adhesive was used, but there's no reason to suspect other than a wheat based paste, in most cases (at least here in the U.S.). Use some fairly hot water with just a few drops of dish soap in a spray bottle and, using a rough sponge, simply spray, let stand for a few minutes, wipe and do it again. If the adhesive proves to be other than usual wallpaper paste, then maybe gardenknowin's idea sounds good...