One of the easiest ways to remove a heat stain from wood is by rubbing the stain with a solution of baking soda and non-gel toothpaste. A baking soda and toothpaste mixture is an ideal heat-stain-removal method for lacquer-finished wood.
Clean the stained wood to remove any dirt or grime. Mix equal parts baking soda and toothpaste to create a thick paste. Rub the baking soda and toothpaste mixture into the stain. Wipe off any excess paste with a dry cloth. Continue applying more paste and wiping the stain until the heat mark is gone. Wood that does not have a lacquer finish or that has large heat marks may need to be refinished.