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You can try the old skunk remedy which is soaking the dog in tomato juice. Also, disposable vinegar douches (used externally to pour the solution on the dog!) can help with a really stinky smell. A vinegar/water wash would probably work just as well. The douche might be handy because it has an applicator.
Vinegar mixed with water will help, but I'm not sure if anything will take away the smell completley. I would use a 50/50 solution of vinegar to water.
When all else fails, you can see the groomer and just have the dog shaved.Good luck!
Let me know if you still have questions.