The best way to remove urine & feces stains and odors from concrete is with Skout's Honor!
A good surfactant/detergent based cleaner (like Skout's Honor branded cleaning products) is ideal for this type of application, because it gets down into the porous concrete and separates the urine and feces from the surface so that it can be washed away.
Steps to take:
Step 2: Let it soak into the surface like urine would. About 5 minutes is good. If you are dealing with stubborn or saturated stains, you can use a stiff-bristle brush to help loosen the urine from the concrete.
Step 3: Hit it with the hose. Spray until the water running off the surface is clean and clear.
Step 4: Allow to air dry.