As others have said, it’s mostly carbon.
You can use oven cleaner, but that is a bit of a nuclear option. I use copious quantities of Cif and leave it sitting for a while. You can then scrub it off with a plastic scritcher (I mean one of those sponges with a tough nylon scratchy surface and a soft sponge surface).
I wouldn’t use brillo pads on a cooking sheet, they usually have nonstick surface and it’ll get damaged.
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