...A STEADY HAND! ZZZZZZZZZZAAAAAAAAAAAAAAAPPPPPPPPPPPPP!!!
Remember the game OPERATION? I saw a Spider-Man version in Toys-R-Us a while ago. I also think there is a Shrek version too!?!
As much of a perfectionist as I am, I would leave 'em alone. My ILLINOIS squad doesn't have necks, but that's prolly accurate for any Big Ten or Big 12 team! GATORS / SEC / ACC prolly should have necks.
If GUTTMAN says he can do it, then you could too.

Use a small brush to do the back and sides and just barely get under the facemasks - we can't see that area anyway. Then you'll prolly have to clean up the jersey and then the helmet. Should be a 1-2-3 step process and then re-seal it. Good Luck.