If you frequent fast food restaurants and have an abundance of those little ketchup packets you might want to use your excess to clean any copper items you have!!!! Squeeze the condiment onto the metal and gently rub with a sponge. Your vessels will be polished and shiny in no time because the acids in the tomatoes and vinegar will remove any dirt and oxidation from the copper without damaging the metal. save the money you would have spent on copper polish for something else!