I had ear infections back in 1979-1980. I lived at the beach in SoCal and body surfed a couple of times a week. I went to 3 different specialists in CA costing several C notes apice. They cleaned with a loop, washed with hot water and I applied the anti-biotics as per instructions. Nothing seemed to work and the pain became so bad I had to take codine for relief. I happened to be in Gainsville Florida to score some weed and went to a very old EN&T specialist who charged, believe it or not, ten bucks a visit. He turned me on to the '2 parts alcohol to 1 part white vinegar' cure. He told me to use cane alcohol if it was available. I've been using it on q-tips after every shower for 40 yrs., as the Colorado River water we get in SoCal has a high salt content. I mix up a new batch every few months. It works for me.
The vinegar is to set a proper PH to hinder fungal growth. The alcohol is anti-bacterial and a dessicant to dry the ear cannal, so I would use 70% plus.
Take care of each other.