10. Vinegar + Salt + Cornstarch = How To Keep Your Copper Squeaky Clean
Mix 1 tablespoon of salt, 1 cup of vinegar, and 3 cups of water in a pot.
Drop your copper kitchenware in the pot and bring the mixture to a rolling boil.
Remove when clean.
Be sure to give everything a quick once-over with dish soap to eliminate any lingering vinegar-y scents.