I had the same problem with my bp so i put him in a warm, damp towel in a tub, over top of a heating pad to keep him warm (if you dont have a human heating pad which is what I used, just make sure the room is warm and you soak the towel in nice warm water) and I let him sit in there for half an hour or so then took a look to see if he got it off. He actually had a piece of shed attached to it that loosened in the towel. I used a wet q-tip and ever so gently rubbed the corner of the eye and it came right off. if you are uncomfortable doing the q-tip part, thats ok, try the towel and he may rub it off on his own.
If it doesn't come off, it will either before or during the next shed. If you can put the tub with him inside it right in his enclosure, that would be the best way to keep it warm while hes in there.
Hope this helps, Just my own experience.