What is the best way to get rid of strong cat pee smell?

[Jin Zhang]

Hi everyone, 

I have a tenant who has been living in one of our units with his two cats for the past two years. Everytime I visit his unit, I could smell a strong cat pee smell in the kitchen where he left the cat litter box. He is leaving soon. What is the best way to get rid of cat pee smell? Do you have any recommendations on product, device, or professional services? 

Thank you! 

Gin 

[Nathan Gesner]

Quote from @Jin Zhang:

Talk to your local vet. They often sell a product that will neutralize cat urine.

Clean with a vinegar solution first, then treat with the enzyme cleaner. If odor remains, try an ozone generator (run for 12 hours, air out the home, repeat a couple times). If it's still there, the next step is to remove the flooring, paint the floor and walls with an oil-based primer to seal in the odor, then put in new paint and flooring.

If you miss even a little bit, the odor may stay forever.