You honestly might want to replace the carpet. The carpet and pad and possibly the subfloor may be urine soaked. You can paint the subfloor with a smell blocker and then put in new pad and carpet. It’s a lot more expensive but then you know what you are getting. Also carpet doesn’t have a huge lifetime (depending on the material and quality) so if it’s 10+ years it might be at its age limit.

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Thanks, that immediately fixed the issue for me!