Have you ever... Let a pot of water on the stove boiled dry? Did this with a copper clad pot, it got very hot and a layer of black tarnish formed on it. I let it cool down, and to avoid getting throttled by the wife who was out of town, I'm trying to figure out how to clean it. About 70% of it flaked right off, but on the other areas it's tenaciously! I've used Tarnex, Brasso (even though this is copper, and Wright's Copper polish and cleaner. It seems to be cleaning up slowly with the copper polish, but it's taking tons of elbow grease. I'm wondering if there is a product designed for this specifically? For now, I've got the pot hidden away. HELP!