Urine Off Cat and Kitten Formula is the #1 Veterinarian recommended product for pet urine odor and stain removal. It uses a combination of naturally occurring micro-organisms and their enzymes to digest uric acid crystals, urea, and proteins, permanently eliminating urine odor and stains at the source. This USDA Certified Biobased Product is safe for humans and animals, unscented, and contains a pheromone blocker to prevent re-marking. It is effective on both fresh and dried stains on hard and soft surfaces, including litter boxes. For best results, allow the product to dry completely on the treated area. Avoid contact with eyes, skin, and open wounds. Keep out of reach of children. Do not spray on humans or animals.