I'm always torn in these situations.
He looks to have a whole body shed retained from the wrinkles. My problem comes in the form of refusing to give people money for snakes like this as they will simply get in another one and repeat the pattern.
Adopting him for free just to give him a chance I could agree with - with the proviso that if you know he has mites then order Provent-a-mite and treat the enclosure before bringing him home and placing him in it.
For removing the shed I would try a damp pillow case.