Thats a different one, put a moss box into his exclosure. A box with moist (not wet) moss or a damp cloth etc. Cut a hole in a lunch box or ice cream box etc. You could also mist the enclosure, if he wasn't fond of the bath its probably best to not spray Nyoka in the face.
Another one that you could try is wet a pillow case, squeeze out as much of the water as possible. Pop Nyoka in the pillow case and use your hands to hold and encourage movement in there, create tight bits that has to be pushed through. Give that about 15 minutes or so and then let Nyoka out and see what has happened.
I always throw a couple of wet flannels into the rubs if any of mine struggle with their shedding, bumps the humidity right up and it`ll come off in no time.