YES, You have to put something on the urine first. According to the back of these products you must put this on first before shampooing. So it will neutralize it and break down the emzymes. If you shampoo first it mess the break down up... ???? I'm no scientist but that is what it said to do.. I did it and it worked. I let it dry for a whole day then shampooed. It worked take the black light over stains before you shampoo and make sure they are gone. Some of mine I had to retreat and then wait another day til the black light showed nothing. If you clean your carpets and dont do this then you are just weting the urine and it will spread out more. |