Plug in a hair dryer and set it to the lowest heat setting. Turn the air flow on and direct it at the white discoloration. Hold the hair dryer at least 6 inches away so that you do not scorch the wood. Continue holding the hair dryer in place until as much of the stain disappears as possible.
Wait until the wood cools and then pour 1 teaspoon of a wood oil product directly on top of the white discolorations.
Put on rubber gloves and rub the discolored area with a 4-0, or 0000, steel wool pad, which is very fine. Use circular motions as you rub to polish out the white stains.
Wipe the wood surface with a clean soft cloth to remove the oil. Examine the wood for signs of remaining discoloration and repeat the process as needed until it no longer remains.
Apply a furniture wax or polish to the wood to prevent future white discolorations from developing.