I had the bottom of a gallon of milk explode in the back door area behind the back seats, by the time I got home it had run all the way down underneath the carpet to the floor board of the passenger floor board area. It was a total soak through all carpet and padding. So I immediately tore out all carpet, seats belts, everything got torn out immediately. I soaked in all types of cleaners, I shampooed I left out to dry, I hung to dry. All in all I got it pretty near perfect, but in the middle of all that I bought a used set of carpet from one of the members here and installed that. But before I layed down both a layer of sound anti-vibration and sound deadening layers.

So..... I still have my old set that smells great, but in all the cleaning I did I removed the padding on the back.