Hi there.
(before i leave this H&S dictates i take no responsibility if you singe your eye brows).
I would go with the burn out option. If you get it off the bike, take some petrol, fill it then leave it too soak over night. Pour out the petrol, put too one side. Take a lighter and set light to one end. If you have a compressor gently blow down one end, you should have a flame thrower effect out of the other end, you really must do this out side, take great care. When nice and hot give it a couple of good taps with a hammer, the carbon should fall out. Good luck.