use some hot ass water( you an ehat it up in the microwave), poor a some on the spot. use the foam from the autzone, foam works the best. spray it on the spot( dotn try to the entire carpet at once, do a small part at a time. then use the brush and rub it in one direction back and foward, after you do that for about 1 min ro so. take a clean towel and wipe the stuff up on the carpet, take about 5min to do this, making sure the towel is geting dirty with the stain. if it gets to dirrty get another towel. do this about 2 times or so or until the stain is gone. the water is used to bring the stain to the surface of the carpet.
i used to work at a great car detail shop( and i still detail cars today)