Blot up the urine as soon as possible: Absorb as much of the urine as you can by blotting it with a clean, absorbent cloth or paper towels. Avoid rubbing, as this can spread the stain.
Use an enzymatic cleaner: These cleaners are specifically designed to break down the proteins and crystals in urine, which makes it easier to remove the stain. Follow the instructions on the product label for the best results.
Make your own cleaning solution: Mix equal parts white vinegar and water. Spray the solution onto the stain and blot with a clean cloth. Rinse the area with cold water and blot dry.
Use baking soda: Sprinkle baking soda liberally over the stain and leave it there for several hours or overnight. Vacuum up the baking soda and blot the stain with a clean, damp cloth.
Use hydrogen peroxide: Mix equal parts hydrogen peroxide and water. Spray the solution onto the stain and let it sit for several minutes. Blot the stain with a clean cloth and rinse with cold water.
Test your chosen solution on a small, inconspicuous area of your carpet before using it on the entire stain. This will help you ensure that the solution doesn't damage the carpet fibers.
If you are unable to remove the stain, consult a professional carpet cleaning service.