Cleaning a French horn is essential for maintaining its sound quality and longevity. Regular cleaning helps remove dirt, oil, and moisture that can accumulate inside the instrument. To clean a French horn, use a soft cloth to wipe the exterior and a flexible cleaning snake or brush to clean the inside of the tubing. Additionally, it's important to clean the valves and slides. Remove the valves and soak them in warm, soapy water, then rinse and dry thoroughly before reassembling. Regular maintenance, including cleaning, ensures that the French horn remains in good playing condition.