I thought it was just a fact of life that baking pans (or cookie sheets) eventually get covered in baked on black stuff, and there was basically nothing you could do about it (even with scrubbing with soap and water).
We even got rid of 2 baking pans before we moved because they were so bad that I didn't think they were worth packing up and moving.
However, this recipe works wonders on getting rid of the gunk with very little scrubbing.
My pan is only a couple of years old and not super bad. You can see that there's still a bit of stuff left on the edges, but it's much better than before!