What preventive measure should be recommended to a swimmer with a history of swimmer's ear?

The recommendation to use ear drops of alcohol and vinegar for a swimmer with a history of swimmer's ear is based on their effectiveness in preventing the condition. This combination acts as a drying agent and helps restore the natural acidic environment of the ear canal, which can inhibit the growth of bacteria and fungi that often lead to infections. Alcohol aids in drying out any excess water in the ear, while vinegar (acetic acid) helps to maintain an acidic pH, both of which can significantly reduce the risk of developing swimmer's ear again after swimming.

This preventive measure is particularly important for individuals who are frequently exposed to water, such as swimmers, as it provides a targeted approach to managing moisture in the ear canal, which is a primary factor in the development of infections.