So after boiling over tomato soup a few times I realized every time it boils over I would have a shiny copper spot where the soup touched the copper part of the pan. So this week after everyone was finished with their lunch I put the remaining soup into a pie plate heated it up in the microwave and then set my pans in it an left them over 30 mins. Came back and they were shiny. Washed off the soup and viola a clean pan. No Scrubbing with steel wool or anything else. Hope this has helped you in some way.