Hydrogen Peroxide, Baking Soda and Dish Soap
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Fill a bucket with 4 cups of hydrogen peroxide. If possible, use high-grade peroxide -- such as 20 or 35 percent -- over the common 3 percent that is available in drug and grocery stores.
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Add 4 tsp. of baking soda and 4 drops of liquid dish soap to the peroxide. Stir the contents together with a wooden spoon of several seconds, until thoroughly mixed.
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Pour the mixture carefully into a clean garden sprayer. Mist the smelly outdoor locations with the mixture. Let the mixture air dry and repeat the process as needed.
Vinegar and Water
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Fill a clean garden spray with equal parts cold water, and white vinegar. Stir the water, and vinegar together with a spoon.
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Mist the offending area with the diluted vinegar, and let it air dry. Take care when spraying vegetation with the mixture, since vinegar can kill grass and plants.
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Repeat the process, if the odor remains.