I couldn't believe it either but, it does work. My almost 13 year old Cockapoo Miranda, although paper trained, does miss and over time, that specific section I keep her papers in, needs extra cleaning. I first steam clean with regular cleaning solution. I then RINSE several times with just hot water. THEN, I add a solution of Apple Cider Vinegar and go over that area 2 times. Amazing how within a day, there is no sign of urine smell.