Cat urine smell coming from under my kitchen sink.Don't have a cat.Live in an apt.Maintance can't find where it is coming from.It;s making me sick.I've sealed all holes under the sink,cleaned with odorban.It's not in the drain

Mouse urine can smell a lot like cat urine. Have you found mouse droppings anywhere ?

Tick

Yes, ditto to mouse urine. Smells awful, and mice love to live under sinks. Under the toe kick, so you won't find them. They can squeeze through spaces the size of a coin slot. The worst smelling cleaner I could find in my mother's stash of cleaners was pine scented ammonia, which smells worse than plain ammonia, if that's possible. Or bleach might be better. Put it in a spray bottle or pour it around the pipes. Of course you never use bleach and ammonia together!