What I personally do and I have snakes with a stuck shed or just having a hard time shedding is putting them in a sterilite tub or a Rubbermaid tub with warm water. Of course something that's not to too hot or too cold for the snake also will leave them in there for about an hour. I don't put any air holes or anything in it because it'll hold the humidity a lot more. Any time I've had snakes who have a hard time shedding or stuck shed after doing that a couple of times most of the skin will come right off.