Drop the scouring pad and try this trick from Apartment Therapy instead: Fill the pan with warm water and lay a new dryer sheet flat on top to soak overnight. In the morning, the baked-on gunk will have either floated off or be loose enough to scrape off with a spatula.
According to the comments with the article, a used dryer sheet works as well. So if you are out of energy and can’t scrub anymore, or you are out of baking soda (is there anything this powder can’t clean?!), grab a dryer sheet!