Use flour to help the process of cleaning copper. Step 1: Make Paste. Mix 1/2 cup distilled white vinegar (or lemon juice, which is more acidic) with one tablespoon of salt and enough flour to ...

The next step is to create a cleaning paste. ‘Take that lemon and cut it in half. Sprinkle some salt or baking soda on one half, or directly onto the copper surface, says Tara Steffen from ...