getting rid of urine smells can cost a lot - budget it in and ask questions - it may mean laying new floors not just taking out carpet.

I also give them common examples of deductions that may occur due to ripping out floors for pet urine; trim/door damage; pet odors etc..

Rent to some one with cats , cat urine will block out the smoke smell  .............................................................  

If it really is cat urine and you have carpet in there, you may need to rip it out along with the pad, then check the subfloor and, if not too much damage (as in the urine hasn’t fully saturated the plywood), bleach, killz, an ozone unit, the replace/ reinstall the flooring.

With another house, the bathroom had two showers, a toilet and a urinal.

Urine will immediately be diluted with 2 gallons of water to prevent the grass from yellowing. 

If you go up to the front door, it just reeks of urine & general "ick."

At a certain point crazy people are easier to tolerate, like learning to appreciate the gagging smell of cat urine in a target property.

Feces and urine , it will be behind walls , in the attic , in the insulation .

There's no visible evidence, aside from the 42 pound bag of cat litter.I did some research and found I can photograph urine stains if I illuminate them with a UV light.