I am a professional pet groomer, I hated spending so much money on ear cleaning solution. I researched a lot and came up with my own mix and it works great. Not only does it save me a lot of money, but I know all the ingredients it has in it.
I use an old ear cleaning solution bottle and mix 2 parts water, 1 part rubbing alcohol, and 1 part white vinegar. Try it and you'll never waste money on store bought solution again!