Janet, I have noticed over the years that not all cat pee is the same.
We had a cat early in our marriage who had the most pungent smelling pee you can imagine. Like straight ammonia!
All of my cats are spayed and neutered but occasionally there have been problems and I've always gotten it out. It's always been stress-related when they've gone outside the boxes.
Glad it all worked out for you!! :D:D