I have two pairs of X-metal XX Ti02. And when I wore them in the early 2000's I didn't clean the rubber or frames. Now I have the very sticky residue on the rubbers which I will try the wash and boil method. But my question is the frame. All that oil and sunscreen under the rubbers leaked out onto the arms and orbitals while in storage and dried as a hard yellow sticky residue. How do I get this off my X-metal without damaging the finish? All the other threads were more about regular cleaning of X-Metal. This is almost a first time cleaning.