Remove the waste, then use an old spatula or butter knife or a spackle tool to carefully lift any residue from the carpet. Soak the area with a laundry stain remover or other product designed for pet stains according to the manufacturer’s instructions. Then use a clean wet sponge dampened with a combination of cold water and laundry detergent to blot the area.
Blot the urine with a white cotton cloth. Spray the area with one part white vinegar and one part water to neutralize the uric acid. Then mix a teaspoon of clear, mild, nonbleach laundry detergent into 4 cups of water and apply to the stain. Rinse with water, then press with a clean cloth over the area to absorb the water. Repeat these steps until the spot is gone.