You might check into renting an ozone machine.

I my own self would seal that floor after using the ozone machine;

even if no odor seems to remain, pets' senses of smell are so much better than ours.

Best luck!

I have never heard of an ozone machine and had no idea that ozone will eliminate odors. What model do you own? I will buy one if necessary.

I don't own one, but a couple of sellers or buyers have used them to eliminate cigarette smoke smells, & one couple used one when they bought a house where a disabled person had lived, uncared for, for many years. The house reeked of urine & rotten garbage.

Check the places in your area that rent equipment, maybe start with a big box home improvement place.

I think you'll need to clean and seal. Can't comment on the ozone machine ....never used one........but for regular cleaning find an enzyme cleaner recommended for kennels.

Also, I don't think you'll get good results with regular paint but instead will need to use a concrete sealer product.

You need to kill the bacteria that causes the odor (although that doesn't seem to be the only thing that is oderous because it smells when they first go! It is what they say smells). Definitely clean with enzymes first. Later after fully dried and set for at least a few days follow with the hydrogen peroxide treatment you can find on this forum. Saturate, let them really soak in it. I'd let that sit for a week or two and then retreat also.

For sealing, Kilz Original oil based sealer for odors would be my choice. More than one coat. It's white but you could always follow up with a concrete floor paint.

Read all directions for every product's use so there are no adverse reactions between them.

If it's a rental, you may want to consult with the owner first, they may have a preference on what they want done AND it's probably something they should be footing the bill for.

I agree with snookums2, clean first and then seal ...

I agree with the others about cleaning then sealing. I've never used an ozone machine. A friend of ours who owns a car detailing business owns one and says it's absolutely the best way to remove odors.

I agree with the others about cleaning then sealing. I've never used an ozone machine. A friend of ours who owns a car detailing business owns one and says it's absolutely the best way to remove odors.

I used 2 gallons of Nature's Miracle "Urine Destroyer." There's already a noticeable improvement. Such that I think I am now smelling the carpeted area outside of the unfinished basement. Presumably the cats tracked the smell onto the carpet. Have to see what I can do for carpets. Thanks for all the replies.

If you GOTO amazon.com and search on ozone generators you'll get lots of returns and many, many reviews. The couple I briefly looked at were in the $80-$120 range and generally received positive reviews. I also gathered that you use these in unoccupied spaces - no pets nor people while operating.

I have zero experience with these.

Thank you. I rented one and have it running in the basement now. I let it run overnight and thought that I had solved the problem. Took it out and a few hours later the smell was back. This was after using 4 gallons of Natures Miracle Urine Destroyer on it. So ... I turned it back on and will let it sit another 24 hrs or so and see if that does it.

If I was in that situation I'd ask for advice on the concrete/masonry forum. Might be better knowledge there as to what concrete absorbs, how deeply it absorbs it, and how to deal with it.

Not sure if you have solved your cat urine issue yet?

I wanted to give you a recipe that will eliminate the urine and the odor. It may have already been posted but here it is anyway.

1 (16) ounce bottle of Hydrogen Peroxide

1 (tsp) baking soda

a couple of drops of dishwashing liquid like Dawn or Palmolive

pour the peroxide into a clean container, add the baking soda and the dishwashing liquid, stir very gently to dissolve the baking soda.

Pour onto stained area and leave it alone for 24 hours.

This solution is the Best and most effective I have ever seen or used.

If you can get ahold of a black light, you can turn it on and the urine areas will glow.

After you use the above recipe and leave it for 24 hours, if you turn the black light on, the stains are gone and so is the odor.

Give it a try, I think you'll be pleasantly surprised at the results.

Thats it. You can double tripple or quadruple this recipe for very large areas.

I found that the home made cleaners did next to nothing. Nature's Miracle did work some, as did SCOE 10x. Oddly, what worked on the skim coat of cement in my basement was Oxi-clean. I sprinkled it on and swept it around and left it there. A couple weeks later I did it again. My sense of smell isn't as good as housemate's, but I can't smell the area at all any more. It wasn't quick, maybe took six months of repeating the treatment, but a container of oxi-clean is pretty cheap.

I didn't intend for my cats to urinate on the floor. They had three or four litter boxes down there, cleaned daily. Sometimes cats just do things. I finally stopped giving them access to the basement. What I had hoped (that they killed the mice) wasn't happening anyway.

I agree, I have never found any cleaner very effective either. I will promise you though, if you ever get another opportunity (hopefully not lol), give it a try.

It is the only concoction that I 100% no works...uhm...100% of the time.

L.

One month later and i have done 3 different things that combined have made the smell better. But not great. I used Natures Miraclr Urine Destroyer. 4 gallons over about 300 sqft of concrete floor. Then i put an ozone machine down there for 48 hrs. Then i sealed the floor with 3 coats of shellac. Still smells. Not as bad but still smells. This is a short term rental and i have given up.

A lot of people swear by the hydrogen peroxide solution. Now that it's sealed, it won't work. I hope you had permission because now you have sealed your landlord's very serious problem in. I would not be happy if it were my house.

I did have permission. I spent about $400 out of my own pocket to remedy a problem that made 1/3 of my $3000 monthly rental unusable. If it were your house maybe you would have remedied the problem or prevented it before you rented it out.

At this point I would say that the smell is no longer emanating from the concrete floor as I do not believe that anything would penetrate 3 coats of shellac. I believe it has seeped into the concrete block walls, framing lumber and insulation. I have given up.

I definitely would have addressed the problem myself and would never give anyone else permission to work on my own house. I also would not rent or buy a house that has urine odor. It's a real shame if a previous renter damaged the home that way. They are notorious for not caring and causing damage and that particular problem is very difficult to get rid of without replacing materials.