With carpet it depends on how deep it went. If it's a big spot, chances are it's through the padding and maybe even subfloor, and the odor comes back if not completely neutralized. I've had to pull up and replace padding before in spots because once it gets in that stuff, it's hard to get out. The carpet itself isn't the problem.

Also, once you've seen underneath a carpet/padding that has some age to it, you won't want carpet again. It's no wonder odors linger.

carpets, clothes and beds, yea, never had trouble removing a cat urine smell using white vinegar.

for stronger smells, ill pour vinegar over the whole area, leave it alone until it dries, pour more, the smell always goes away eventually.

got it.

I prefer waiting a few minutes for odorless non-toxic stuff.

commercial detergents or sprays are usually oil-based and that smell lingers. but when the petrochemicals are flower or lemon-scented, people don't mind so much.

I'll just drown it all in vinegar!

nope, it doesn't!

when vinegar dries, the acetic acid which is responsible for the vinegar smell evaporates, so it's completely gone after the vinegar dries.

If you still smell vinegar, then your vinegar has never dried, and is lingering in the middle of a futon or mattress or other thick padding.

If you have a dehumidifier, you can make sure whatever you pour the vinegar on is completely dry.

then there's no smell and the smell won't come back because the acetic acid has evaporated.

awww haha, I remember you.

you digging through my history?

it's interesting, I'll give you that.