Proper maintenance of a trumpet is essential for optimal performance and longevity. Regularly clean the instrument by removing the valves and rinsing the body with warm water. Use a soft cloth to wipe down the exterior and a brush to clean the inside of the tubing. Lubrication is also crucial. Apply valve oil to the valves to ensure smooth operation and use slide grease on the tuning slides. Additionally, check for any dents or damage, and consider taking the trumpet to a professional for repairs if needed. Regular maintenance helps keep the trumpet sounding its best.