Black lights and pet urine. Have you tried this?

I'm sure we've all seen the 'amazing' and
'handy dandy' commercials featuring a chemical
of some type shown with a black light to locate
the stain or odor, but have any of you actually used
such a method / product?

I found a cheap knock-off in a catalog, which reminded
me of the product itself. Wouldn't one accomplish the
same thing with a black light and Clorox Clean-Up?

Many thanks,
Karen Marie