Mix equal parts boiled linseed oil, gum turpentine and white vinegar.
Apply a liberal amount of the mixture to a clean rag.
Gently rub the rag against the steam marks in the direction of the wood grain until the white stain is gone.
Plug in your iron to reach a medium heat.
Place a clean, white, lint-free cloth directly over the steam marks on the table. An old T-shirt works well.
Slowly and gently iron over the white cloth. Check often to be sure the T-shirt is not sticking to the wood. Do not rush. Keep the iron moving slowly over the cloth.
Remove the cloth when the stain is gone.
Apply lemon oil to another rag, and buff the entire surface of the table to restore its shine.