Not underpants, underpad.
We moved into an older home this time last year and the carpet was the second item to go after the wallpaper. (Which ought to be made illegal and the producers, distributors and retailers should be fined and placed into community service stripping the paper and glue off everyone’s walls, repairing those walls, and following up with a personal, hand written apology for having been willfully ignorant of the strippable wallpaper’s non strippable glue.) Those were dark days.
Back to the carpet:
It looked clean but smelled bad. When we lifted the carpet we discovered it was actually the underpad that smelled really, really bad and the carpet had been acting as a barrier to the odor. So, we pulled, rolled and stacked every last little spongy scrap of that underpad and stored it in the garage for haz-mat disposal (it was a rainy week, we had no choice).
Now, if you have a dog and you let it be a dog, you know they love to roll in some pretty nasty stuff. It’s instinctive, it masks their scent and they can be more successful hunters; so they roll in poo, roll over dead frogs and squished squirrels, pretty much anything that’s not “predator” smelly.
Including that underpad.
Yep, that’s our uber-dog Tiger-dog lollygagging in that pile of underpad. She’d been sleeping in it for hours.
We tried the odor-out skunk shampoo,
We tried Febreze,
We tried the shampoo again,
Finally we just had to live with our happy stinky dog.
And, I found her in the underpad the very next day and No, I’m not that bright, I could have closed the door …