Maintaining a French horn is essential for optimal performance and longevity. Regularly clean the instrument by using a soft cloth to wipe down the exterior and a flexible cleaning snake to remove debris from the tubing. Ensure that the valves and slides are lubricated with appropriate oils to prevent sticking and maintain smooth operation. Additionally, check the mouthpiece for any buildup and clean it regularly. Store the French horn in a protective case when not in use to prevent damage. Regular maintenance not only enhances sound quality but also extends the life of the instrument.