Cleaning Sheet Pans
from https://www.thekitchn.com/, We Tried 5 Methods for Cleaning Baking Sheets and Found a Clear Winner

Sheet Pan Cleaning Method: Baking Soda and Peroxide
Total time: 8+ hours (10 active minutes)
Rating: 5/5

The method: Sprinkle baking soda liberally all over the surface of the pan, then spray a generous amount of hydrogen peroxide over the baking soda until all the powder is wet. Let the whole thing sit overnight. Then, use a plastic scraper and scrape all the baking soda into a pile and dump it into the garbage. Wash the pan in warm, soapy water with a scrubby sponge.

How it went: After scraping away the dried baking soda, I got down to business with the scrubber and was pleased to see that the stains were coming up quite easily. It took some effort, but not much, and most of the stains were lifted. The before and after was seriously impressive and I loved the hard work was done for me while I slept.