Anyone with a dog knows the unpleasant smell that dog urine can leave behind. The smell can be particularly strong outdoors, as outdoor surfaces are left unwashed. Exposed to the sun and other elements, the dog urine smell can grow intolerable. In addition, dogs are inclined to use the same spot repeatedly. A combination of watchfulness and a few common household ingredients should eradicate the urine smell.
Identify the source of the odor. The spot may still be damp. Otherwise, follow your nose to the area that smells strongest. At night, a black light can be used to identify the spot, which will show as a bright glow.
If the spot is damp, a hose with a nozzle attachment and a little strategically placed soap should eliminate the smell. Adjust your nozzle to the highest level of pressure.
If the surface is porous, such as cement, and the urine has been left to dry, mix a little bleach with water and pour it over the surface. Allow the mixture to sit for 10 minutes before rinsing the area with fresh water.
For grass and other outdoor organic surfaces, sprinkle garden lime on the area of dog urine. Garden lime can be purchased at a garden center. Douse the lime with water. This should not only eradicate any lingering odors, but will neutralize acidity in the grass caused by the dog urine, in turn helping to keep your grass looking green.