Hero Cleaners
Cleaning advice from the professionals.

Pet stains are one of the most challenging stains to remove from a carpet. In many cases, the stain on the surface is all that there is to deal with so stains are a little easier to treat. If you have a big dog however, you might have a stain and odor that extend below the carpet. Big dogs equal big urine volumes and when they have an accident, the urine will travel to the backing and the carpet pad. Fear not though because the problem can be remedied and there are several ways to go about it.

Enzyme Treatments: This is the easiest way for the home owner to handle pet urine below the surface of the carpet. It involves the application of an enzyme treatment such as Natures Miracle, available at Amazon, to the urine stains. Enzymes will actually digest or eat the organic material in the urine so that it can no longer cause an odor. Just about every pet store sells enzyme treatments and the most common one is called Simple Solution. Purchase a bottle of the enzyme treatment and read the directions on the bottle to see how they recommend that you apply the product. In most cases, the directions will involve mixing up the solution and completely saturating the area that is contaminated with urine. The enzymes will need time to work, so the area will need to be wet for at least 24 hours in most cases. If you live in a dry area, you may need to apply a layer of plastic wrap over the area to prevent it from drying to quickly.
One potential problem with this type of treatment is that stains may occur on the surface of the carpet. Because the carpet will be soaked deeply, soil from under the floor could wick up to the surface. Also, water stains can occur on the surface because of the volume of water. A carpet cleaning or spot cleaning may be required once the carpet is dry.

Physical Removal: The most thorough way to remove urine stains from under the carpet is by physically removing the affected area. To do this, you will detach the carpet from the tack strip and pull the carpet back. You will then cut out the carpet that is contaminated with urine and replace it with new padding. This is a good method if you are handy and have access to a few carpet tools like a knee kicker.
To begin, use your knee kicker to loosen the carpet at the edge and pull the carpet back. Now, take a razor knife and cut out the affected pad and dispose of it. The surface under the pad is likely affected so you will need to wash this area with a mixture of white vinegar and water. Once the area is dry, take a clear shellac and seal the floor to prevent odor from coming back. Now, clean the backside of the carpet with a mixture of white vinegar and water and allow it to dry. Finally, you will replace the pad that you removed with a padding of equal size and density (take a sample to a home improvement store to match it). Bond the edges of the old and new pad together with masking tape. Lay the carpet back down and secure it to the tack strip with your knee kicker. Tuck the edges of the carpet under the trim with a flat blade screwdriver and you are done.

Sub Surface Cleaning: This is a method that will have to be left to the professionals because of the equipment needed. To do this method, your cleaner will need a sub surface cleaning tool and a truck mounted carpet cleaning machine. The cleaner will saturate the area with a urine treatment and allow it to dwell for several minutes. They will then extract the mixture with their sub surface cleaning tool or extractor hooked up to their truck mounted carpet cleaning machine. The truck mounted machine will have the power to remove the majority of the moisture. They may need to repeat the process several times.