We had the same problem at our house when we bought it. Apparently the elderly lady had like 20 something cats in the house and outdoors she also had a ton of raccoons. We ran air purifiers for 48 straight, lent to us from our agent. Then we wiped all the walls and molding with vinegar. Your going to want to clean anyway! We also bought natures miracle from pet smart, it has an enzyme in it that binds to the urine destroying the bacteria.
Covering the smell doesn't get rid of the stuff that can make you and your family sick. Nature's miracle will and it doesn't contain chemicals that are dangerous to you, your family or pets. Finally we kilt-zed and painted everything. Our house is also old, so we wanted to update it a little. We've now lived here 5 years and have never had another problem with smells. Keep in mind also that if you merely cover the smell, you may not smell it but your other pets will and will possibly begin trying to put down their mark as well!
I had the very same problem, but got completely rid of the odor - immediately. My solution sounds messy...& it is...but it worked so well (I was amazed & would do it again, if the need ever arises). I swabbed tomato juice over the areas & instantly it was gone! I let it sit over night, then washed it up with a rag & a bucket of water (after all tomato juice is the only thing, I know of...that takes skunk odor away). I did this 5 years ago & it has never come back! It's inexpensive and a 'for sure' thing. Try it first, before you go spending money on things that do not work.
I once purchased a duplex where an existing elderly tenant had several indoor cats but wasn't good at keeping their litter boxes clean so the entire unit became their litter box :-( Anyway, after she moved out I found there are safe chemical solutions made especially for removing pet urine odors even in the subfloors. You can purchase them by the gallon at pet supply and home supply stores and they work great. Mop it on full strength and allow to completely dry. Depending on how bad the odor is you may need to do it twice like had to ;-)
Mop with baking soda and sprinkle it on the sub floor. Let it sit for days repeatedly till the odor is gone.
KILZ you brush on will kill anything. As a former property manager, I have used it on a few studs, so that tells you how bad it was. I highly recommend it.
Hope that helps. PBP
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