I know you can use a black light to find urine markings.

I don't think they are spraying. I don't see any obvious marks of urine on the walls(the walls are white..I would think if they sprayed it would be discolored)There's no part of the apartment that smells stronger than others. And believe me, I'm really sensitive about people saying the place smells so as soon as mom left today, I got on my hands and knees and went over every inch of the living room, kitchen and bathroom.


I don't know what to do about it. I'm cleaning as much as I think I should...maybe I should be scrubbing down the whole place more than once a week....*sigh* I'm guessing it must be coming from the litter boxes...I scoop at least once sometimes twice a day...but short of dumping and scrubbing more often than once a week I don't know what to do. I'm not sure why I'm having such a smell problem when I've heard of some people that only scoop the boxes every other day and change out the box only once a month.

Any advice would be greatly appreciated.