From my understanding of M Power, Russels statement of spray, agitate and go isn't as bizarre as it may sound.
If the practice is the same as the theory, on light soiling levels, the soil would be broken into nano particles and madam would vac it all away in a few days time. The product would bio-degrade and not leave any resoiling residues. Trevor Woodman used this to good effect under sofas etc.
For more normal levels of soiling, as the carpets would not remain wet for long enough, I would always advocate a pad or rinse/extract to remove the dislodged soil.
Safe and happy cleaning
![Smiley :)](http://www.cleanitup.co.uk/smf/Smileys/classic/smiley.gif)
Ken