Urine stains are one of the toughest challenges professional carpet cleaners face. The visible yellow stain is only part of the problem. Urine often soaks through the carpet backing and into the pad, carrying odor-causing contamination well below the surface. If you only clean the carpet fibers, the stain and odor often return. The key isn't simply using a urine stain remover. It's using the correct process that allows the chemistry to reach the contamination, break it down,