The best way to clean black appliances is by scrubbing with a cloth dipped in warm water and mild detergent. Wipe away dirt and stains with circular motions.
Soak the cloth in water before applying the detergent. After scrubbing the stains with water, wring out the cloth. Add a few drops of dishwashing soap if there are remaining stains on the surface.
When the stains are gone, squeeze the cloth out again and remove any remaining soap on the surface. Wait 10 to 15 minutes to allow the appliance to dry. Use a dry cloth to remove streaks and buff the appliance.