How to clean your cookie sheets--Kitchen "Miracle" Cleaner! You put about 1/4 cup of baking soda in a small glass bowl and squirt in hydrogen peroxide until it makes a nice paste.
Then you rub it on the offending dirt/stain/grease...whatever! You can usually just use your fingers...but you can also use a small sponge as well.
Let it sit for a couple of hours or even overnight to work.