A little salt and vinegar will clean copper bottoms on pots and pans. Just sprinkle on, rub lightly and wash as usual. Or, rub with a wedge of lemon dipped in salt. Wipe off with a wet cloth, dry and apply lemon oil or wax.

You can also remove dried on food from plates pans and dishes. If the food is really stuck fast and burnt on sprinkle cream of tartar on the area and then spray with white vinegar. Just wipe off and rinse.