This Pro-bacteria and enzyme formula neutralizes even the toughest pet urine odors quickly, preventing remarking. It safely breaks down pet urine proteins that are hidden in carpets and other surfaces, eliminating urine smell and stains rather than masking them. Urine Destroyer is a fast-acting stain remover that can destroy tough stains, even those that are old and dried in. It's easy to use in and around your home, and is safe to use around pets and children as directed.