I have a snake that's going through the same thing. Had her since October (she had the stuck pieces when I got her), and it took her second shed a couple weeks ago to actually get some of the stubborn stuck shed off her head (she always got her eyecaps off). Here's a pic before she got the stuff off her:



I would put him in a damp towel case for a bit so it softens up his stuck shed and then have him run through a damp washcloth to try to peel away the stuck shed. You can gently rub his head with the wash cloth over the stuck pieces if he lets you.