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Updated over 8 years ago,
Cat Urine - How can I remove completely?
I had a tenant who brought in 2 cats and an unapproved dog. Upon her move-out after a year, it appears that the cats and dogs were having turf wars. There was a HORRIBLE stench in the stair landing that has no windows. I took a black light to it and it just lit up the hallway with all of the streaking, dripping, and puddles. I had a contractor to come and remove the carpeting in the stairway and the entire downstairs. He said the whole back of the carpeting had urine stains and there was some dampness still on the subfloors in the stairway. DISGUSTING.
So, he applied Zorbit on the stairway overnight and the next day, he applied 2 coats of
oil-based kilz original. It helped a lot but did not get rid of the smell completely. You can still smell it in the air. Next step, we plan to apply a coat of the Zinsser Bin on the staircase and walls in the staircase, hoping that will get rid of it. Then use a deodorizer in the paint to help freshen up the smell, and open the windows to flush it out.
I have no idea what else to do to eliminate the odor. Any other ideas?? Get the air ducts cleaned or use an ozone treatment? I am hoping the shellac primer works, but worried because the smell is so pervasive.