How do you effectively clean a copper bottom pan to maintain its shine and quality?

To effectively clean a copper bottom pan and maintain its shine and quality, mix equal parts of vinegar and salt to create a paste. Apply the paste to the pan and scrub gently with a soft cloth or sponge. Rinse thoroughly with water and dry immediately. Alternatively, you can use a commercial copper cleaner following the manufacturer's instructions. Regularly polishing the pan with a mixture of lemon juice and baking soda can also help maintain its shine.