I usually pull all the floor panels and do them in the driveway. Then, I use a home style Bissell upright steam cleaner. I use the hand attachment for the corners. You can allways do it the old skool way, you can always use a scrub brush to bring the knap back. You can use a hose to gently soak the carpet and let it drain out the bilge drain. A bucket and some liquid laundry soap will do'er. It doesn't really take any longer either way, just use a shop vac to extract the water if you use a hose so it will dry more quickly.