Hi, Andy is dead write about finishing one side or the other of a wooden piece of furniture and it makes no difference whether the piece is old or new as wood will always react to its environment, sooo try a bowl of warm water with a sprinkle of bicarb in a solution, a drop of vinegar and a drop of olive or linsead oil, clean in the direction of the grain and immediatly wipe with a dryish cloth ,leave open to air dry you could add a drop of bleach but if this is a treasured piece of furniture go easy on treating the inside, if not you will raise the grain and distroy any colouring on the surface. Try a small area first after its dry you could use a spray polish with some wax in it but this may require you to leave the doors open longer to get rid of the polish smell. Good luck .