There are plenty of cleaners on the market for cleaning up your copper cookwear, but if you want to save a few bucks, be kind to the environment and don't mind a little elbow grease, then head for the fridge and grab the ketchup!
The acids found in ketchup will eat tarnish up!
Give your cookware a light coating and wait. (Depending on how tarnished we're talking here, you're looking at from 5 minutes all the way up to 30 minutes). Then rinse and dry!