Amazing! I have an older chihuahua without the best bladder/poop control who doesn't always hit the potty paper�. I have tried every carpet soap, and enzyme cleaner ever made, without much luck.� I decided the science behind MPP seemed like this stuff would work. � and it has outdone my expectations! ��� stains that were over 2 years old are gone, no smell, nothing visible. My dog can't even find her old potty spots, to re-mark them. I catch her sniffing around & hustle her outdoors! I love My PetPeed!���