Might sound like a crazy idea, but depending on the car, it may be easiest to remove the carpet and clean it out of the car. There may be pooled sauce under the carpet in the floorboards that will continue to leach into the carpet otherwise.
For many cars there are pretty good DIY tutorials on removing the trim/seats/etc., to get the carpet out. I've run across many at the various car audio forums.
For many cars there are pretty good DIY tutorials on removing the trim/seats/etc., to get the carpet out. I've run across many at the various car audio forums.