Check to ensure all of the knobs are turned to the "off" position and none of the burners are heated.
Lift off grates from stove and place in a sink.
Spray the grates with a kitchen cleaner spray for cleaning mild spills or use a mildly abrasive cleaner for hardened spills.
Allow the cleaner to penetrate for at least five minutes. Wipe clean with a damp sponge.
Use the abrasive side of a sponge for tough spots. If the grates still fail to become clean, scrub lightly with a soap-filled steel wool pad.
Rinse thoroughly with clean water and dry with a towel before replacing.