I had a foster dog who peed like crazy in a guest bedroom and I didn't figure it out until the smell was really, really bad because I never went in there.
We had a professional carpet cleaner come out, and they cleaned it, and it was better, but only by about 50%. Which was no where near good enough. They told me I'd probably need to rip out the carpet and the subflooring or whatever it is called.
In a final attempt to deal with it in an easier way, I sprinkled it with a bunch of baking soda, opened the windows, and closed the door, and left it and then vacuumed it up the next day. After doing that about 3 or 4 times, the smell was gone. Baking soda is powerful stuff when it comes to odor removal. YMMV.
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