Baking pan stains can seem impossible to get out, no matter how hard you scrub. Left untreated, that brown, burnt-on greasy residue on your cookie sheets, muffin pans, cake pans or other bake ware can end up affecting the flavor of your culinary creations. Greasy, oily build-up and stains on your sheet pans and bake ware can be persistent, and a standard cleaning with soap and water usually won't do the trick.