Here is a recipe about how to get skunk smell out, not sure about fox.Take 1 quart of 3 percent hydrogen peroxide (available from any drugstore), 1/4 cup of baking soda (sodium bicarbonate for you science types) and 1 teaspoon of liquid soap, such as Ivory. Mix and immediately apply to the stinky pet. Rinse thoroughly with tap water. The merging of the hydrogen peroxide and baking soda creates lots of oxygen in a big hurry. This chemical reaction is key to how the solution works, but it's also fierce enough to explode in a closed container. Which is why Paul Krebaum hasn't capitalized on his discovery. There's just no way to sell something you can't put in a bottle.
And it's a shame, too, because the man deserves some kind of reward. The stuff really works. Not like tomato juice, which dampens the odor a little and leaves you with a slightly less-stinky pink dog. Commercial preparations seem to fare a little better, but even with them it's the passing of time that seems to finally do the trick. The trick is the oxygen, which grabs the molecules that go into that horrid smell. Once snagged, the smell is neutralized. Simple chemistry, really. Since Krebaum published his findings in a trade journal in 1993, his magic formula has spread far and wide, offered up by agriculture officials and hunting magazines, and touted by folks on the Internet. The Chicago Tribune gave him a good write-up in 1994 that got picked up by newspapers all over the country. In it, he called his mix a "free-gift-to-humanity type deal." Found this on a website, thought I'd share... try it for fox, it's really suppose to work on skunk.