I did this yesterday.....first of all, I remove all the floormats. Then I vacuum all of the carpet thoroughly. Next, spray a good bit of blue corral upholstery cleaner and scrub with a hard brissel brush, then scrub it very well.....wen you are done with that, "comb" it into a pattern so it dries good. Let it sit for 15 minutes, then vacuum thoroughly. When it is all done, get a 12 inch or shorter ruler, then make stripes very carefully by going in opposite directions.....do same for floormats.

I will post pics 2morrow