Turn on an iron to a medium-high setting and let it heat. Place a clean lint-free cloth on the mark and press for five seconds with the hot iron. Check to see if the white mark is gone. If not, repeat the process several more times. This works on damage that occurred on wood with wax finishes. You can also heat the cloth with a hair dryer.
Dampen a cloth dipped in salad oil and rub over the mark. You can also use a dab of mayonnaise for the same effect. Wood surfaces with oil finishes respond well to this treatment. White toothpaste rubbed into the mark with a cloth will remove white marks on stained furniture.
Pour three to four drops of lighter fluid onto a cloth or enough to moisten the area of wood with the mark. Rub the lighter fluid into the wood. Then make a paste of powdered pumice with two or three drops of vegetable oil mixed into it. Rub this on the area you just treated with lighter fluid and the marks will come out. This method works best on furniture with polyurethane coatings.
Dampen a lint-free cloth and then add two to three drops of household ammonia. Rub in the direction of the grain until the white marks disappear. This is ideal for marks that are very deep into the wood.
Buff the wood with furniture polish or wax to finish the process. Start at the center of the furniture and buff outward with a clean lint-free cloth. Follow up with another clean cloth or the reverse side of the same cloth to remove any excess polish or wax.