You can naturally clean copper with materials usually already found in your home.
1. Vinegar and salt: Rub a mixture of 1 tablespoon of table salt and 1 cup of white vinegar onto the copper with a soft cloth and rinse. Or, immerse the tarnished copper into a pot of 3 cups of water and the salt-vinegar mixture, bring to a boil and boil until the grime and tarnish comes off. Once the copper is cool, wash it with soap and water, rinse and rub with a soft cloth.
2. Ketchup: Not just for your burgers, a small amount of this common kitchen condiment can be rubbed onto tarnished copper to restore its natural luster. Then rinse and dry.
3. Lemon: cut a lemon in half, add salt to the cut side and rub gently onto the item. You can also make a paste with lemon juice, and equal parts salt and non-oxidized cornstarch or baking soda.
4. Baking soda: Combine this mineral with lemon juice to clean copper naturally, or sprinkle just baking soda onto a cloth and polish the tarnished copper.
Or If it is an item I have made, you can mail it to me and I'll clean it, polish it, and seal it so that you never have to worry about it again. Feel free to message me for more information on this.
WARNING!!!! Cleaning copper that has a patina added to it will remove the patina.