Note-Do NOT do if you have PE tubes! I would also suggest half hydrogen peroxide and half water to prevent drying out the ear canal. Hot shower water also melts ear wax naturally. I clean ears for a living!
Swimmers Ear: 19 Home Remedies for How to Avoid It
To prevent swimmer’s ear, put about 4 drops of this homemade ear drop solution (1 part vinegar to 1 part alcohol) in each ear after a day in the water. This is not for use if you already have an existing ear infection– the alcohol simply helps dry out your ears while the vinegar helps combat the build-up of bacteria. If desired, insert cotton balls into ear to hold in ear for a bit.