Armor All? It's the black rubbery stuff. Not sure what it is as far as chemistry.
I kind of had the auto parts store theme in mind when I suggested Armor All. But to the first point, I guess I'm still afraid to leave it on when in water. I take it off when I shower or when I know I'm doing something with a lot of water. I'll have to get over this but I'm still in that mindset of keeping electronic devices away from H2O.