one
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Soak a cotton swab with alcohol, squeeze it clean, do not get too wet, insert the cotton swab into the headphone jack, turn it around and pull it out, repeat several times. Just don't break the swabs with too much force.
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two
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With a hair dryer, aim at the earphone port and blow it far away. Blowing too close will cause the phone to be hot, which will burn the internal parts of the phone.
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three
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After cleaning, then plug in the headset to try, it is best to turn off the phone when cleaning, clean up after the boot to try the effect.