This is what I have done in the past and has worked wonders. This is also what the emergency vet recommended to me.

Mix in a spray bottle,
1/2 bottle of hydrogen peroxide
1/4 cup of baking soda
1 tablespoon of Dawn dish detergent
Fill the rest with water

Once mixed, spray the solution onto your dog, be careful not to spray in eyes, mouth, nose. Wash your dog with this solution like you normally would and rinse off. It takes 95-99% of the smell off the first time.