Clean the sink with a rag and soapy water to remove any discoloration from the porcelain’s surface. Wipe it with a dry cloth to remove residue and moisture.
Pour 1 teaspoon of baking soda into a bowl. Add ½ teaspoon of warm water and stir.
Rub the baking soda and water mixture onto the burn spot with a clean rag. Apply moderate pressure when rubbing the paste onto the spot. Leave the baking soda paste on the sink for 10 minutes.
Scrub the area with an old toothbrush to rub away the burn mark. Don’t scrub too hard or you risk scratching the porcelain.
Wipe the sink with a damp rag. Dry thoroughly.