Remove dust and loose dirt with a soft cotton cloth, soft-bristled brush or a vacuum cleaner with a dusting attachment.
Wipe the wood with a clean cotton cloth and oil soap. Alternatively, wipe the wood with a weak solution of two or three drops of liquid dish detergent in a cup of warm water. Never use dishwasher or laundry detergent.
Rub gently to remove dirt, oil and grime. Use a cotton cloth to dry the surface of the wood.
Clean the leather inlay by wiping it gently with a cloth dipped in a solution of 1 cup of warm water and 2 to 3 drops of liquid dish detergent or castile soap. Wring the cloth so it's barely damp.
Remove the detergent by wiping the leather with a clean cloth dipped in warm water.
Buff the leather with a clean, dry cloth. If the leather still appears soiled, wipe it with a damp sponge dipped in saddle soap, then buff with a dry cloth again.
Dry the leather thoroughly and then apply a leather conditioner. A high-quality leather conditioner softens, conditions and preserves antique leather. Apply the conditioner according to the recommendations on the container.