Sprinkle sodium bicarbonate (baking soda) over all the surfaces of the instrument and let it set for a few days. Vacuum the instrument by using the detachable hose.
Scrub the piano organ's wooden parts with chlorine bleach diluted to get rid of odors coming from mold, mildew or fungus. Mix together 1 cup of bleach and 1 gallon of water. Let the piano air dry.
Put five or six charcoal briquettes inside the piano organ; they will absorb any odor, but they need to be replaced every two months.
Wipe the wooden parts of the organ piano with a solution that is half vinegar, half water. Saturate a sponge and wipe all surfaces. Clean the sponge with warm water between each application. Vinegar is an acid; it will cut through the resin and tar left out by the smoke after a fire.
Put naphthalene balls inside the piano. Close the instrument.