I have used the enzyme based cleaners and find they really do work.
Linda C

yup- and the black light thing does too...though remember that bluing, some disinfectants, and some other household things also show up, so don't scream when you first turn it on, eh>?

I swear by the SC Johnson General Purpose Spotter! With a three year old I needed SOMETHING!!! I've never seen it anywhere, I think it's a commercial product. I'll include the link below for anyone interested.

Here is a link that might be useful: SC Johnson General Purpose Spotter

ANY blacklight will work. Hold it close to the carpet. If you have a male cat that sprays, check out the walls, too. For females, check out the corners.

Don't freak out. You're going to see things that will surprise you. If it's yellow, it's urine. If it's white, it's probably something used to clean up the urine.

I don't have a cat, but last year learned more about this stuff than I ever cared to know!

Like cat urine being notoriously difficult to get rid of.