Nickel plated

Don’t see how, it’s just coke.

Rust or something, or build up of something

Doubt it. You could just polish it with a q tip with mothers or something.

I used diet coke on my nickel skywalker and the wooly markmont and it didn’t harm anything. Ate up the silicone a tad bit but not enough to have to replace it. That’s probably the fastest and easiest way.

What a waste of a good 50. Drink!