It's bacterial... so you need to follow antibacterial practices. Monolaurin supplements might do the trick. One of the less well known supplements. Monolaurin is lauric acid from coconut oil which is anti viral, anti fungal, and anti bacterial in nature. Good news is Monolaurin is pretty cheap compared to some supplements. Some people swear by the stuff. I have yet to try it myself, none of the stores around here carry it. Wallmart does have it in some locations, but not in mine.