For the record, the reason you will want to clean your headphone jacks is they can accumulate dust over time. If left unchecked for too long, it may develop connectivity issues. Thankfully, cleaning them is not going to be too monotonous of a task and can actually be done with a cotton swab. Be gentle when you insert it inside the jack, though. Also, for more difficult debris, you can dip the swab in rubbing alcohol. Yet, do not drench the inside of the jack with the rubbing alcohol (you will not need that much).