We have a mobile groomer who comes here once a month and grooms my three, but when we did it I always rinsed them with apple cider vinegar. Our’s seldom get the ear problems, but in the summer when they are in the water a lot we use the Vinegar recipe on the Zim Cocker site once a week after we come off the lake. It has vinegar, alcohol, boric acid and betadine in it.
It doesn’t have to be apple cider vinegar, unless you are making a salad.