Very old stuck shed skin. Any advice

[Bogertophis]

Update: My snake shed today. still problems with the bit that was stuck when I got it.
Sorry I couldn't bring myself to do the wet snake bag thing, it felt like waterboarding. I know its ok, I am a bit soft.
Anyway. I filed a tub with water at the right temperature put a lid on it, left it in there for an hour, and this time it came off.

I'm glad you got to it- I've seen snakes refuse to eat when patches of old skin are left on- it seems to make them think they're "in shed" when they're not.

I usually do a container with shallow slightly-warm water, but you also could have tried a wet cloth on his neck- you'd have to sit with him either way to make sure it did the job. You mentioned he's a bit thin, that's probably part of the reason he got "stuck"- shedding takes good hydration & good nutrition. I've never had water fail to get even old shed skin off a snake.