You can wipe the outside of your ocarina with a damp cloth or a dry cloth to polish it up a bit. If you notice that it stops playing as clearly, you probably need to clean out the mouth channel. To do so, carefully pass a thin needle or flat toothpick back and forth through the mouth channel (the part you blow through) to clear out any residue or buildup. You may need to do this a couple of times, and give it a few short, sharp blasts to clear out any debris.
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