I know this chap is a member on here cos I've read the thread, and I must say I am impressed. Correct me if I'm wrong but that's 1 pass using detergent & lift off straight in the tank.
Now you can't tell me this method doesn't work? Just look at what he has achieved?
How long would it have taken us to pre-vac, pre-spray, agitate, dwell, clean, rinse, rake, turbo dry that lot?
Is he doing it wrong or are we?
Again, I'm not knocking this guy, he's done what seems to be a remarkable job & I've never met him
http://www.youtube.com/watch?v=blixBc2HBqo