Moisture and heat can damage any wood finish.
Over time, air and sunlight will change the color of natural wood.
Never pour oil, soap or water directly onto the furniture surface. Always use a cloth dampened with the substance being applied. Do not use cleaning products containing solvents or detergents.
As normal use wears away the oil polish, apply Bona oil when needed (1 to 3 years). Treat all sides of the wood, and always work in the direction of the grain.