Just to chime in on an old thread.

Add 12oz of Isopropyl alcohol to a spray bottle. Then add two tablespoons of Boric Acid. Then add 12-14 drops of Genetian Violet.

The alcohol serves as a carrier and quickly evaporates taking some of the moisture out of the ear. The Boric Acid lowers the Ph of the infected area. Most ear issues end up being fungal but treated as bacterial resulting in multiple trips to the vet. The Genetian Violet serves as a topical.

It works for an infected ear and it also great as a monthly preventative.

I also used it on a friend's horse who had foot rot.

The biggest drawback is it is deep purple and stains like all get out. Use gloves.

Cheap alternative to multiple vet trips.

EWO