I am and have been a big fan of homemade ear beer for years. 1/2 VINEGAR 1/2 RUBBING ALCOHOL. I put it in before a dive to kill anything already in the ear canal so the pressure doesnt push it in farther, and then always after each dive. When I get home I add it to an ear and lay on my side watching TV usually for 5 minutes, then switch ears and repeat. Its a good idea to use an ear wax removale solution with a bulb of warm water to wash it out before starting your dive season. Then earbeer from there. I have no medical experience but have plenty of dives and it is a useful and cheap aid in earcare.