Flush Dried Dog Urine with cool water (do not over saturate - use just enough water to loosen up the dried dog pee from the carpet). Let sit for one minute. Then use an extractor, or wet vac to clean up old dog pee from carpet. Continue extracting water until carpet no longer feels wet.
Repeat that step over and over until the spot is entirely gone.
My favorite tool for this is the Bissell Quicksteamer Powerbrush. Although not really a steamer, when you use very hot water in this you create a kind of hot steam cleaning effect on your carpets.
However, when cleaning dog urine, I really recommend using cold water so that you do not "set the stain" any more than it already is.
Pre-treat the stain first by flushing with the cold water. Do not over saturate. Just saturate enough to loosen the dog urine from the carpet and pad. Then use the Bissell Quicksteamer Powerbrush like a vacuum to extract all of the liquid from the carpet and pad.
For best results, go over the carpet very slowly in the area that is wet. You should clearly see the water being pulled into the Bissell.
Continue slowly going over the area, and rotate the direction that you move it across the carpet, until you no longer see any moisture or water going into the chamber.
You can allow it to dry - or - if the stain is still evident - you can flush it with water again, let sit for a minute and then extract all of the water from the carpet until it is as dry as possible.
In some cases, the dog pee may have seeped into the pad below the carpet. If that is the case, you may be able to flush and extract as above. For more difficult and deeply urine soaked areas, it may require pulling up the carpet in that area, cleaning or replacing the carpet pad in that area, cleaning the carpet thoroughly, separate from the pad, and then re-attaching the carpet over the cleaned or replaced pad.
When doing any kind of pet urine removal from carpets it is a good idea to do it on a day that is warm enough to leave the windows open. Having proper ventilation will not only speed the drying process, but sometimes it is necessary to air out the room due to urine odors that can become activated during the flushing and cleansing process.
Many times you can tell that you will need to repeat the process if there is a significant amount of odor after flushing and extracting has been done.
However, it is also important to understand that if those odors have become stronger after flushing and extracting, that you have found an area that really was heavily saturated with dog pee and definitely needed attention.
Just keep repeating the process until until the urine odor and stain have disappeared, and no longer return when the area has dried.
Always open doors and windows to allow for fast evaporation to allow the carpet to dry completely.
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