spot shot works incredible,wally mart.
Maybe for small areas, but I cant see that working on the entire carpet. And if all of it is dirty, if he does the really dirty areas, then hes got one super clean area, which stands out against the rest of the carpet.
I had taken my carpet out when I was going to dye it (which is probably way more involved than you want to get). I took a spray bottle and some Woolite laundry detergent (1detergent : 4water), and misted it onto the carpet. Took a scrubbing brush and went to town. Used a shopvac to vacuum the dirtyness that was loosened by the scrubbing, then did it again.
It cleaned up well, but the PO had used some spray on dye to cover up all the stains on the carpet. I had to remove the spray-on crap before I put it in a bath of Rit dye. Now its stainfree, and Black!