1. Disassemble the trumpet. Remove the mouthpiece, slide, valves, and any other detachable parts.
2. Rinse the individual parts with warm water. Hold each part under a stream of warm water and gently rinse it. Take care not to use excessive force, as this could damage the instrument.
3. Use a soft cloth to wipe away any remaining moisture. Dry each part thoroughly with a soft cloth to prevent rust or damage.
4. Clean the inside of the trumpet with a trumpet snake. Insert the trumpet snake into the lead pipe and gently push it through the entire length of the trumpet. Rotate the snake as you push it through to ensure that all areas are cleaned.
5. Apply a lubricating oil to the moving parts of the trumpet. Apply a small amount of lubricating oil to the valves, slides, and any other moving parts. This will help to keep the instrument in good working condition.
6. Reassemble the trumpet. Put the trumpet back together in the reverse order that you took it apart. Make sure that all parts are properly aligned and secured.
7. Play the trumpet to test it. Once the trumpet is reassembled, play it to make sure that it is in working order. Check that the valves move smoothly and that the sound is clear and consistent.