I have 3 basic recipes for a paste that will clean your copper easily and cheaply:
Paste One
Using equal parts of the following
Paste Two
- Baking Soda
- Lemon juice (enough to make a paste)
Paste Three
- Cream of tartar
- Lemon juice (enough to make a paste)
The method of use is the same for all three recipes.
Mix all the ingredients together to form a paste, use the paste as you would any metal cleaner. Buff clean with a soft cloth.