Mix equal parts water to vinegar and pour the mixture over the affected area to saturate and let it dry.
Liberally sprinkle the baking soda over the spot.
Then stir up a mixture of hydrogen peroxide and dish liquid (four parts hydrogen peroxide to one part detergent) and lightly rub the mixture onto the area. Use a brush (old toothbrushes work wonders), gloved fingers, or whatever else you have on hand to get the job done.
After it dries, vacuum the area. If the smell remains, repeat the process.