Just the other day I literally considered throwing away my beloved cookie sheet because it looked so horrendous. It was honestly kind of an embarrassment to make ANYTHING on said sheets. As I was walking my sheets to the garbage can I had a thought; what if there was a way I could make this look new again? Guess what? There is! You only need two things. baking soda and hydrogen peroxide.
Step One: Make a mixture of baking soda and hydrogen peroxide. I found it easiest to coat the bottoms of my cookie sheets with baking soda, and then pour hydrogen peroxide over the top.
Step Two: Let your baking soda and hydrogen peroxide soak on your cookie sheets for a few hours. If you desire, you can even add baking soda to the mixture to make the mixture SUPER strong.
Step Three: After a few hours has passed, dump out the hydrogen peroxide mixture, and wipe your cookie sheets clean. Seriously! You’ll likely find that all of that baked on gunk is easily removed with just a quick wipe.
Step Four: If your cookie sheets still aren’t quite clean enough, repeat the process! You’ll be amazed at how much MORE gunk is removed!