Scotty from Dublin?????? (Okay Then)
I have had the same probs just recently on a borrowed rib (Mine not too well at mo)
The only thing I found that would get rid was ........ Jif Lemon Liquid...... worked a treat but only use a smoooth cloth - i.e. duster or cotton rag - not a plastic pan scrub....
best of luck. (ps you will have to be slipped though - LOL