Do you mean the drinkable or the burnable coke?
Either way, you need help! Locally and miles from Leicester there are a few computer shops which would clean it for you. One in particular I would trust absolutely, the rest ....... I might do better myself.
It must be the same in Leicester, so word of mouth is the bottom line.
If it was Cola (and not British Coal) do get it drained and dry a.s.a.p. :-)