Ive done the black light test.... frightening huh?  Mine was from my 16 year old cat.... nice,,, cat pee is the worst!
Use this great stain/odor remover...  I've posted it before on here,it always gets good results.... 
1. normal size bottle of hydrogen peroxide
2. 1 tablespoon of baking soda
3. 1 teaspooon of Dawn dishsoap 
mix together and pour on stains....or put in squirt bottle and spray.. dont leave in the bottle can combust... ( I guess)   
It wont stain or do anything to colored carpets,,I've used it on all types. 
Hope it helps,,, I used it for ODOR remover, but people say it helps with stains.  
