You might try immersing the whole thing in warm slightly soapy water. I just re-read your op so assume you just can't get them out at all.
eta: I am no expert, but did play brass and woodwind instruments throughout school so am just trying to remember the things we used to try when we fucked up our instruments. (not that we ever did that of course. haha)
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Kind words are the music of the world. F. W. Faber
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