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You should probably give the horn a bath first. Take it all apart and put everything except the valves in hot water with dishwashing liquid. After 45 min-1 hour, run a trombone snake (brush) through the horn to get everything out. Rinse the horn out a couple of times and then run a dry lint free rag through the valve casings to dry them. Wash the valves by hand, making sure that you do not get the felts wet. Let the horn dry overnight and then oil the valves and reassemble the horn. If they still stick after that, you need to have a pro look at them.

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