Caring for brass instruments is essential for maintaining their sound quality and longevity. Regular cleaning helps remove dirt, oil, and moisture that can cause corrosion. Use a soft cloth to wipe the exterior and a cleaning snake or brush for the interior tubing. Additionally, lubricating moving parts, such as valves and slides, with appropriate oils and greases ensures smooth operation. It's also important to check for dents or damage and seek professional repair when necessary. Proper storage in a case protects the instrument from physical harm and environmental factors.