With the greatest respect Tony, may I suggest that if you are needing to make 5 or 6 wet passes, that you may not be putting enough work into the preparation of the carpet. You therefor leave the carpet much wetter than you need to (this will be proportional for any type of extractor, portable or T/M) Good dry-vac, pre-spray and agitation will reduce your wet passes to 1 or 2, the results should hopefully be drier, often quicker and at the end of the day you will be less tired. You should rarely need to scrub with your wand.
The exact technique used will vary from tech to tech, kit to kit and job to job. My own prefered wand is a Cleancare heavyish cast aluminium, 10" width with 4X02 jets. This delivers a little more water but in a smaller area than a conventional 2 jet swan neck wand. I single pass the area being worked with about 1" overlap, 2nd pass as required then dry stroke. Should the area be so heavily soiled that the results are not good enough, I will then spray, scrub and extract again, but this is quite rarely needed. I probably spend more time on agitation than with the wand.
Safe and happy cleaning:)
Ken
