Did you try this?

    Paul Krebaum, a chemist, invented a new more effective formula for de-skunking a dog. Mix in an open bucket or bowl:

    1 quart of 3% hydrogen peroxide
    ¼ cup baking soda
    1 teaspoon of strong liquid soap such as dishwashing detergent.

    Mix the ingredients in an open bucket or bowl. The mixture will fizz. Wet your dog and thoroughly massage the solution into the coat. Be sure to keep the mixture out of the dogs eyes, nose and mouth. If it is necessary to apply it to the dogs face, very carefully use a washcloth or a sponge. After applying the mixture to all parts of your dog that may have been sprayed, rinse the dog thoroughly.

    *Warning*

    This mixture can be explosive, as it will fizz and creates pressure if it is enclosed in a seal tight container. Never store unused portion, always discard. Be sure to only mix in an open container and do not try to store or cover it in any way. Do not get the mixture into the dog's eyes, nose or mouth.