I once lubed inside a Grip Shifter with Finish Line teflon lube, and used that for a long time.
Now I disassembled everything, and the outer rubber part is quite stained and sticky.
I tried to brush the teflon aside with water and soap, and even a mild degreaser, but since teflon is not exactely grease, I just spread the stains even more.
So, question is: Which substance / method should I use to clean that?