Email to Linda Carnation Cleaner - Cleaning Copper Pots + Pans Source of Recipe from tdj Cleaner - Cleaning Copper Pots + Pans To clean the bottoms of your copper clad cookware: Apply about a teaspoonful of tomato ketchup and spread it all over the area to be cleaned. Let sit for a minute. Use a light scrubber for just a little bit. Rinse. You will be amazed.