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How do you remove urine odor?

Updated: 9/14/2023
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8y ago

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Removing pet, rodent, or human urine and the resulting odor from any material that is porous is a tough job because as the urine dries the component of the urine that is responsible for the odor (uric acid) changes or decomposes into ammonia gas and urea salt.

When the water in the urine finally evaporates, the ammonia gas is not longer produced but the urea salt is still there waiting for a little water vapor and hydrogen sulfide to change into mercaptan gas (the same group of gass that give propane and natural gas their odor.)

There are two forms of urea salt. The one that has chemically bonded to what ever it precipitated on and the crystallized version. The bonded version is very difficult to remove because it is not longer soluble. The crystallized version is readily soluble in water, but if not removed from the contaminated area and left to dry, it too will chemically bond to the material if it can not find some other urea salt to crystallize on.

If there is no detergent residue in the contaminated area, enzyme urine odor remover products (like Natures Miracle, Simple Solution, OdoBan and others available mostly at pet stores) will neutralize the urea salt by accelerating its conversion into mercaptan gas. This can take as long as several days during which time the contaminated area must be kept wet. Often the odor produced is really bad but when the odor is gone, it will not come back unless the enzyme product dried out too soon or the area is recontaminated. Enzyme products often work well on carpet padding too.

An alternative to enzyme products are water soluble organic essential oil products (OdorXit Concentrate) that work in combination with detergents and surfactants to neutralize the source of urine odors. These products, like enzyme products are contact chemistry (they must come in direct contact with the offending material in order to neutralize it.) The biggest benefit to these products aside from the fact that they permanently neutralize the source of the odor, is that they work in several hours and product very little mercaptan gas in the process on a wide variety of hard and soft materials. The down side is that carpet padding does not respond very will.

The last and poorest solution is perfume cover up products. If you want your house to smell like lilac or bubble gun plus urine, there are plenty of products at the grocery store to choose from.

Finally, there are no home made urine odor removal products because urea salt simply does not react with the stuff you have around your house except for water and hydrogen sulfide. Bleach, vinegar, hydrogen peroxide, detergents, all will dissolve the crystallized version of urea salt but will not neutralize it. If not removed this action will make the contaminated area larger and more difficult to repair.

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