When you have done your best cleaning and the yellow urine stain remains, Pro’s Choice “Urine Stain Remover” is the answer. Simply spray “USR” on the stain and watch it disappear. “Urine Stain Remover” is self neutralizing on all synthetic fibers but is not recommended for use on natural fibers like cotton, wool, or silk. Dilution: RTU pH at dilution: 4 Container Sizes: 128 oz. Form: Liquid MSDS