H.S.
What I would recommend is dilute some hydrogen proxide with water and use a qutip to spread the mixture around where the blackheads are ... it should clean out the dirt enough so that they'll clear up and go away; and if that doesn't work, get a really mild face soap and have him rub it with a qutip just inside. Then, make sure he cleans off the i-buds or buy him a regular set of headphones. Good luck!