Nature's Miracle Advanced Stain & Odor Formula 64oz (1/2 Gallon) The most advanced Natures Miracle formula, incorporating the best performing cleaning technologies Deeply cleans to remove all pet mess traces, discouraging the spread of unsanitary pet waste Pet-Block  System removes pet pheromones and destroys odors on contact to prevent re-soiling Faster drying to minimize tracking Packagining may vary