I don't usually go out of my way to review a product. Brasso worked very quickly on my copper bottom Revere Ware. make sure the copper is dry. Use a 3m type scrubber. Rub it into the surface and let it sit for a moment. Then give it a little extra elbow grease on the tough spots and you end up with this...It works on other metals too. My first picture is what it looked like to begin with but a different pot. The second is the after. It has been years since I went to the effort to polish these pans because of the effort needed. Each pan I own is going to get this treatment the next time they are used! Thanks Brasso!