Cleaning up old smelly pee stains?

depending on how long it has been you may not be able to get the stain out. I am sure your carpet prolly has padding underneath and that has sucked up all the odor of the pee. So while a carpet machine or other remedies work on the carpet, you need to clean or replace the padding underneath. one thing you can do is get the shamwow you see on tv (yeah it really works) this is what i did to old stains from a spay surgury. I took sudsy ammonia and water and just dumped it on the stain. like at least 2 cups, just pour it on. Then let it soak in there a minute or two to make sure it gets down to the padding. Then take the shamwow and put it on top and roll it gently patting the rag. It should suck back up all the stuff you put in and hopefully clean the padding of the smell without you having to pull up carpet. I did it on mine and it worked great. You might be able to use something other than shamwow but that is what actually absorbed the water back up from my padding, when i used regular towles, it left my carpet soaked and sloshy, but with the shamwow, it was just damp afterward.