My golden lives in the pool during the summer and is prone to the ear infections. I clean her ears daily with the Epi otic mentioned above. I've used it on all my other Goldens in the past as well. It works great!!
The vinegar/alcohol is a good one as well. I use it on the kids and the dog if I'm out of the ear cleaner. If you have swimmers in your family, human or canine, this is a must have in the medicine cabinet during the summer.
Epi-Otic Ear Cleanser ($12.95 from Amazon) for an initial cleanse, the finish off with Mometamax Otic Suspension ($26.99 from 1-800-PetMeds).
You'll need an Rx from your vet for the Momentamax, but it's the best thing since sliced bread and will knock out a yeast infection quicker than you can say M-O-M-E-N-T-A-M-A-X.
My English Mastiff is prone to them, and this combination has always worked well for her.
One part red vinegar, one part alcohol, one part water, one part hydrogen peroxide. Take a cotton ball and saturate it and clean the outer part of the ear and squeeze a little bit into the ear canal. Do this daily until it is gone. My vet told me this will not hurt the dog, works everytime. You can also give your pet a teaspoon of yogurt daily and this helps prevent them. Plain yogurt, no fruit