"We bought an older home that was neglected and filthy. We had the entire house professionally exterminated, disinfected and scrubbed clean. This has made a world of difference, but the bathroom still has a urine odor..."
As Ed told her, this requires a thorough cleaning! Years ago in Boston, a friend had to clean the bathroom of an apartment where a very elderly gentleman had lived. I never saw it, but her description was nauseating. (Not just urine...)