HOW TO GET DOG URINE STAINS OUT OF CARPET Soak up the urine stain using paper towels or a cotton cloth. Mix one part white vinegar and 1 part water. Pour the solution onto the urine stain while using a scrubbing brush. Work all of it deeply into the carpet, scrubbing vigorously. The vinegar should help to neutralize the ammonia in the urine. Blot the urine stain using a paper towel, pressing firmly into it. When that section of the carpet is dry, cover the stain with baking soda. Mix half a cup of three percent hydrogen peroxide with 1 teaspoon of dishwashing detergent and.