1- Baking soda and vinegar:
Fill your sink with hot water. Add 1/2 cup of baking soda and 1/2 cup of vinegar. Let your cookie sheet soak for 30 minutes. Using a sponge, scrub your sheet metal. Clean with soapy water and you’re good to go.
2- Fabric softener sheets:
Fill your baking sheet with hot water and add 2-3 sheets of fabric softener to it. Let stand 2 to 3 hours. Discard the dryer sheets and change the water. Clean with soapy water afterwards.
3- Peroxide and baking soda:
Create a paste by mixing the peroxide and baking soda. Spread this dough well on the baking sheet, and let stand 2-3 hours. Simply clean up afterwards.