Loosely attach strips of coarse grit emery paper to the surfaces requiring stain removal. Use any heavy duty tape. Just make sure the grit side of the emery paper is in loose contact with the stained surface. Suspend the tarnished pan, pot, or griddle directly in front of your largest guitar amplifier or better yet a PA speaker. Turn all dials to 11. Thrash! (Hearing protection advised.)

-- Emit Flesti.