I have skeletons keys I put in coke to remove rust now their tarnished and look terrible, what do I do now?

If you know someone that reloads ammunition, put the keys in their br tumbler. When clean, a light coat of varnish to seal. Next time, try lemon juice instead of Coke, rinse thoroughly, and dry with hair dryer. You can also polish one at a time with a Dremel.