I received this question today regard a successful removal of pet odor using Pet Friendly For Odor…with a black light. He said…

Using the blacklight to locate the cat urine deposit is the easy part. Once
located and “treated” the black light still shows the deposit. Is
this because the treatment did not work?

Bob

No, what you’re seeing is “History” but More on"So What Do You See With A BlackLight?"