If neither polishing nor alcohol treatment removes the white spots, the damaged finish must be treated with abrasives. If rubbing with ashes is not effective, go over the stained area with a mixture of rottenstone and linseed oil. Work with the grain of the wood, rubbing evenly on the entire surface, until the white haze disappears. If the spots are on a clearly defined surface, you may be able to remove the finish from this surface only; otherwise, the entire piece of furniture will have to be stripped. To remove dry paint or other materials, very carefully lift the surface residue with the edge of a putty knife. Test the stain on an inconspicuous unfinished part of the wood before working on the finished surface.

Remove rubbing cloth

To remove these white spots, first try polishing the surface with liquid furniture polish; buff the surface firmly.

To make your own gentle abrasive, mix cigarette ashes to a paste with a few drops of vegetable oil, light mineral oil, or linseed oil. As soon as the white spots disappear, stop rubbing and wipe the wood clean with a soft cloth. If neither rubbing nor reamalgamation removes the haze, the piece of furniture must be refinished. Lightly buff the stained area with a cloth moistened with mineral spirits; then rinse the wood with clean water on a soft cloth. To stain one area on a surface, use an oil-based stain that matches the surrounding stain. Apply the stain to the damaged area with an artists’ brush or a clean cloth, covering the entire bare area.

Source: https://www.consumerreports.org/kitchen-planning/7-kitchen-remodel-mistakes-that-bust-your-budget/