The *only* think I will use on cat pee now is F.O.N. (Feline Odor Neutralizer), which I purchase online, often from an Amazon seller. It's important not to use any type of ammonia or vinegar on the accident, because then F.O.N. will not work. It's an enzyme action, so I make sure to soak whatever it is enough that the F.O.N. can make contact. I also cover or enclose the item in plastic for several hours to make sure that the enzyme remains active long enough to work on every particle. Then I wash the item as normal.
Over a couple of decades I think I've tried everything else that is on the market. This is the only one that really, really takes out all of the odor permanently. It also doesn't have its own telltale fragrance.