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To apply valve oil, first remove the valve from the casing, apply a few drops of oil to the valve, and then rotate the valve to spread the oil evenly before reinserting.

For lacquered trumpets, use a soft cloth and lacquer polish. For silver-plated trumpets, use a gentle silver polish. Always follow the manufacturer's instructions.

Use a valve casing brush and soapy water to gently scrub the insides of the valve casings. Rinse with clean water and dry before returning the valves.

Remove the valves and check the springs for rust or damage. Compressed springs should be replaced to ensure optimal valve response.

Remove each tuning slide, apply a small amount of slide grease to the slide tubes, and move the slide in and out to distribute the grease.

Use a mouthpiece brush with warm, soapy water to clean inside the mouthpiece. Rinse with clean water and dry before attaching it back to the trumpet.

Remove the old cork, clean the area, cut the new cork to size if necessary, glue it in place, and then trim any excess material.

Remove all removable parts, such as valves and slides, and soak the body of the trumpet in lukewarm water with mild detergent. Gently use a flexible brush to clean the interior tubing.

Check each joint and connection for air leaks by applying gentle pressure to the instrument and listening for hissing sounds, or feeling for air escaping.