Plug in the iron and turn the heat setting to medium-low--use medium if your iron doesn't have the medium-low setting.
Wipe the surface of the table with a clean dustcloth.
Place the dishtowel or T-shirt over the mark on the table surface.
Run the heated iron over the cloth in the area where the marks are for no more than 3 or 4 seconds.
Remove the cloth from the table.
Wipe the surface of the table with a clean dustcloth.
Mix a small amount of toothpaste with some of the baking soda to make a paste.
Rub the paste over the heat mark with your fingers in a circular motion. The paste will begin to feel warm.
Wipe the area clean with a damp cloth.