I purchased a house from an animal rescue person that horded cats and dogs. The house was a 2007 built home but it was completely disgusting. I tried everything known to man but could not get rid of the smell. I tried numerous chemical sprays, paint additives with special sealants with chemical blockers, Kilz, ozone generators, replaced urine soaked baseboards, door frames, doors etc. I sealed the concrete prior to installing flooring. I even changed out the appliances, HVAC and duct-work. Still had the odor! I then tried a more powerful ozone generator and still no luck. Finally I had an ozone generator sized for a 10,000 square foot commercial space flown in from Ohio. I sealed all the doors windows with tape to minimize air leakage (as instructed by the supplier) and let the machine run for 4 days straight inside the sealed house with HVAC blower running. The thing sounded like a jet engine! Problem solved finally! Note that odors are living bacteria! If you don't KILL the living bacteria it will continue to live, reproduce and grow and smell.
You can research plenty of articles on the web that explain how ozone generators work. Needless to say I did not make my planned profit target on the house but did'n't lose either.
Good luck!
Steve
