I ordered this product as a last ditch effort for my cat pee covered couch. I saturated every inch of the couch before going to bed. In the morning, the living room smelled BAD! But it warns you it will smell worse before getting better. So I took the stink as a good sign. Sure enough, 24 hours after spraying my couch, NO MORE CAT PEE SMELL! This stuff is seriously amazing. Now every time my cat pees on the couch I saturate the spot and the smell is gone. I'm about to start potty training my son, and the FIRST thing I did was order another gallon of MPP. Thanks for making such an amazing product!