Soak him in warm water in a large enough tub with a lid on it for a solid 20-30 minutes. Make sure the water temperature is not above 90 or below 80 when you start the soak to ensure it doesn't cool him down too much. Do this for a couple days to rehydrate him best you can. Increase the humidity in the cage a bit, make sure your water bowl is large enough as well. You can get the shed ease spray from Zoomed if you desire, but soaking usually does it.