Is there anything to put on carpet to highlight pee?

Is there a product out there that can highlight pee on a carpet? I have a blacklight, but after 18 years of various episodes of puke, poop and/or pee, my carpet looks like a mottled leopard skin under the blacklight. This makes it very difficult to visually determine new spots--I have to continually rub my hand over spots to see if there is a smell. I keep thinking there must be something out there that can be put on the carpet which will somehow show up the pee. Any ideas or suggestions?

got any easter egg dye left over

Sounds pretty worn! I would suggest new carpet......