A forgotten pot or a burnt-on spill can cause black scorch marks on the burners and hob. Hobs are available in porcelain enamel or stainless steel. Each type of hob requires a different cleaning method. Typically, scorch marks lay on the surface, rather than permeate the porcelain enamel or stainless steel. Removing scorch marks takes some hard work, but restoring the surface is possible.
Wait for the surface of the stove to cool to room temperature. Using a damp rag or sponge on a hot porcelain enamel surface can cause the coating to crack or chip.
Wipe the surface with a damp sponge to remove loose layers of the charred material. Continue to wipe the scorch mark until the sponge comes away clean.
Add 2 tbsp baking soda to a small bowl. Mix in small amounts of water while stirring to form a paste. Apply the paste to the scorch mark and scrub with a damp sponge or rag. Continue to add baking soda paste and scrub until the scorch marks disappear.
Rub the marks with a damp melamine sponge. Rinse the melamine sponge often and continue to rub until the marks are no longer visible.
Apply a commercial hob cleaner to the scorched areas. Scrub the area with a damp rag or sponge until the marks are gone. Reapply the commercial hob cleaner, as necessary, to remove the blackened stain.
Permit the hob to cool to room temperature.
Wet a rag or sponge and squeeze out excess water. Add two to three drops of a mild liquid dishwashing soap directly to the scorch marks. Rub the marks to scrub away the stains. Rinse the rag or sponge and add more liquid dish soap, as necessary, until you remove the entire stain.
Moisten a melamine sponge with water and wring out the excess. Rub the scorch marks until they disappear.
Apply a commercially available stainless steel cleaner with a microfiber cloth to the scorched surfaces. Rub the surface until the scorch marks are gone. Reapply stainless steel cleaner, as necessary, while cleaning the stains.
Remove the burners from the hob. Generally, burners lift off the stove. Fill a dishpan with hot water, add 1 tbsp household ammonia and 1 to 2 tsp of dishwashing soap. Allow the burners to soak for 30 to 45 minutes. Check the manufacturer's instructions for removal if the burners do not lift off the hob.
Remove the burners from the soapy water. Scrub them with a scrub brush to remove the scorch marks.
Scrub the burners lightly with soapy steel wool. Rinse well with plain water. Poke out burner holes with a piece of stiff wire to clear obstructions.
If the scorch marks permeated the finish, consider professional restoration or replacement.
Do not use flammable liquids to clean a hob or burners. Do not use heavy abrasives or steel wool on hobs, as these scratch and mar the surface.