Hi Oomah,
Stains in concrete are difficult to remove as you may find from previous posts.For pet odors,most vets have products which I have heard work wonders but have no first hand knowledge.I can tell you that working in elderly housing,we often run into a similar situation.When carpet adhesive is applied and the new rug goes down,there is no more odor.

Hi Oomah,

Matches is right. Concrete is a pourous material so it pretty-much can absorbe a good bit of any liquid that's left to 'sit' on it over time.

You could mix a solution of 4 to 1 (water to bleach) and 'paint' it on. Just be sure to keep it wet so the bleach gets a chance to work itself into the concrete. Cover the area with a good-sized sheet of plastic while it's doing its thing. This way, it won't evaporate so quickly. Then, at some point, you need to give up and just go ahead and lay your new floor. You could consider sealing that area after it dries. Visit your local Paint Retailer (found in the YELLOW PAGES under PAINT - RETAIL) for a sealer. Just tell them what you're interested in doing so they give you the 'right stuff'.

My best to ya and hope this helps.

Jay J -Moderator

PS: God Bless America!

I agree with Matches and Jay J - washing with bleach and the new floor covering will more than likely solve the problem. If you are still uncertain, you may wish to consider washing the floor with Muriatic acid (follow container instructions exactly - it can be dangerous). Rinse the floor with water, let dry and lay the new covering.

Good luck.