Hi Hachey82! Thank you for your question.
I have actually done an experiment to try and find ways to remove dried coke from paper, without much luck.
I'm not sure if any of our other forum members have any suggestions, but if they do, then I'm sure they'll leave some tips.
I did find that it is exponentially easier to remove coke from paper if you get to it before it dries (which seems like a no brainier). Dabbing it up with a paper towel should be enough to do the trick.
If you have any more questions, or have found the solution, then please come back and post again!