mix ingredients in equal parts into a squirt bottle. I like to use a new hair color bottle since it has a very long tip and narrow spout for squirting into dogs long ear canal. The vinegar kills yeast and bacteria and acidifies the ear canal. The alcohol helps to dry the ear so there isnt excess solution lingering.
Squirt the solution into dogs ear and hold your dogs head for a couple mins to allow the solution to work.
Use cotton balls to absorb as much of the solution as feasible before allowing dog to shake its head.