See this Deeper Blue article:
More on Swimmer's Ear by Divers Alert Network on DeeperBlue.net - Fanatical About FreeDiving, Scuba Diving, Spearfishing & Technical Diving
I think mixing equal amounts of white vinegar and Dickinson's Witch Hazel (14% alcohol) should work perfectly.
Note the importance of a full 5 minutes in each ear, and also how moisturizers tend to remove protective wax and dead skin.
