What is the best way to clean a copper sink effectively?

To clean a copper sink effectively, mix equal parts of vinegar and salt to create a paste. Apply the paste to the sink, scrub gently with a soft cloth or sponge, then rinse thoroughly with water. Dry the sink with a clean towel to prevent water spots. Repeat as needed for stubborn stains. Avoid using harsh chemicals or abrasive cleaners that can damage the copper finish.