How do I clean cookie sheets with baked on grease?

For aluminum sheets: make a paste of baking soda and hydrogen peroxide, spread it on the stains, wait 2 3 hours, then scrub with a non scratch pad. For non stick sheets: soak in warm soapy water for 30 minutes, then wipe with a soft sponge never use abrasive scrubbers on non stick. For stubborn spots on any sheet: line the pan with a dryer sheet, fill with warm water, soak overnight, then wipe clean the anti static agents help release baked on residue.