I have always used Simple Solution. I have a pisser in the crowd, so every morning I have to do inspection and clean. I keep a spray bottle handy.

I would soak every new and old stain and let them dry. It could take days. Keep the cats from renewing the stains until it's dry. Then steam clean. There should be no odor left. THEN cover the floor and wall with something you can clean easily; Sheet plastic comes to mind.

I have a sheet of plastic over my paper towels and a piece of plexiglas in front of my kitchen TV. A bedroom mirror is the current target.