Have you tried
Blue Power recipe? Also good for your own athelete's foot or other external fungal infections. Be sure to gently warm the solution before using. Use it outdoors, and wear old clothes.
Home remedies are fine for normal cleaning, but not good for severe infections or inflammation. Remember this recipe has alcohol in it, although you can substitute witch hazel.
But if you have a staph infection or chronic problems, you really need to go to the vet to get it undercontrol. Failing to do so can result in hearing loss or other problems.
Also, Zymox has been highly recommended on this forum.