we had a previous owner pass away in a home we purchased and when we did a walk through all of his fluids exited his body. Needless to say the smell was very strong through out the 3/1 on pier and b. The real smell over time is trapped inside carpet and under carpet padding and along the cat tacks that hold the carpet to the edges/base of wall. Just because the carpet looks good maybe due to cleaning or spot removal, remember carpet is porous surface will allow air or liquid to pass through it.
1. Pull up carpet and the carpet padding. (don't try save the carpet)
2. Vacuum in between cat tacks and wall (use small nozzle tip to get in the crack.)
3. Mix vinegar and water in new disposable bug spray 70 water 30 v. Set bug sprayer to mist and cover entire subfloor and cat tacks. (don't soak floor but apply evenly)
4. To reduce cost of new carpet. take measurements of carpet area. Find a local carpet company that is owner operator ask them for used carpet that they did a color change on, ask them to text you a pic of the used (pre owned) carpet and settle on a price before they come out.
Hope this helps.