Before you sh*tcan your carpet, and/or remove it or try to pressure wash it, buy yourself two cans of CRC Brakleen in the RED can. Take a clean white towel, put some reasonably thick or durable rubber gloves on, saturate a 2"X4" section of the towel, and then start scrubbing the spot(s). The carpet should be colorfast, and you will be AMAZED at how much dirt you get out of that carpet! I use Brakleen to clean my carpet in my vehicles AND in my house where stains show up. I also scrubbed my '04 Columbia Edition seats with same - they look almost new now! The beauty of Brakleen is that once it dries/evaporates, it leaves ABSOLUTELY no residue WHATSOEVER; no smell either. It's one of my "Magic Elixirs"...
Will try!