Clean the horn with warm water mixed with a mild soap. Dip a cotton rag in the water and wipe the horn. Never soak the horn in water.
Patch scratches with a chalk paste. The paste is made by mixing water and French chalk. Rub the paste into the cracks in the cow horn.
Apply a silicone wax to the clean horn. Rub the wax into the horn using a soft, cotton cloth. If the horn is used for food or liquid consumption, rub it with olive oil.