How can I get stains off my cookie sheets and other baking pans?
If your pans are slightly tarnished aluminum, clean them with a solution of hot soapy water and a little ammonia. Then wipe dry, rub with salt, and polish with a soft, dry cloth. For other kinds of stains, you can boil the pans (if you can find a pot big enough) with some water and grapefruit or lemon rinds for about 30 minutes. The acid in the fruit will remove the stains.