How to remove urine stains from a hardwood floor

Urine Stains on Hardwood Floors

by Dollar Stretcher Contributors

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Urine Stains on Hardwood Floors

After living with the carpeting in a house we purchased several years ago, we decided to remove it and expose the hardwood floors. The hardwood had some large black spots, which I've since learned are pet urine stains. I've tried to remove them in various ways by sanding lightly, using bleach, scrubbing with Brillo® pads, etc. It turned a grayish white with the black still showing underneath, and when I tried to re-stain that section, it just went back to black. Do you have any suggestions short of replacing that section?

Sand and Re-Stain

To remove urine stains from hardwood floors try sanding. Use either regular sandpaper cut and fitted on a sanding block (supplies at $10 or less) or use/rent an electric sander. Once the stain is gone, just re-stain the area with a combined stain-sealer, matching color as best as you can. Luckily, floors don't come in as many finishes as furniture does so it shouldn't be hard to come fairly close.

Urine Penetrates Wood

If the urine penetrated the coating (varnish or paint) and got down into the wood you'll have a hard time removing the stain. That's because wood is made up of plant cells. And cells are designed to absorb and pass along liquids in the plant. The wood absorbs the urine just like any other liquid. And once absorbed, it's part of the cell.

At that point you have three options. Sand the wood and hope that it's only the top layer that took in the urine. Paint the bad wood section a color that's a reasonable match for the rest of the floor. Or replace the affected boards with new wood.

Steam Out Urine

I don't know if this will work, but it could be worth a try. If you can access a steamer you might try using it on the affected section of wood. It's possible that the steam will force the urine out of the wood fibers. Probably a long shot, but you really don't have too many good options available to you.

Hydogen Peroxide

We had the same problem with black urine stains at a home we bought. We found the best thing was to put a thin coat of Hyrdogen Peroxide with a paint brush on just the spot & let it dry. Some times we had to coat it over & over again, with the spot becoming lighter with each application & some stains we just couldn't get completely out of the wood, but for the most part, it worked pretty good.
Pamela N.

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