Chris
Make your mind up...............one minute your saying you're there to clean, not to move furniture................then you're saying the opposite.
Your wand technique, will be dependent on your preparation, that is whether the carpets were vacuumed, whether a prespray was used, what products you use and whether you use them correctly.
Also, of course, the machine being used and the operators ability to get the maximum performance from the system, they're using.
Dave
The number of dry passes will depend on ................how much water you apply, chemical used, whether hot, or not, how well you aggitate and obviously the machine.
Remember..............dry passes will clog your filters and could greatly decrease machine performance
How many do you reckon get the best possible result, from their equipment.............I'd venture to suggest, around 20%.
Carpet wands are referred to, in some adverts, as scrubbing wands and that's exactly how some use them, but good technique will usually get a better result and with less effort.
Although I could probably complete the above job in around an hour, it could, as sometimes happens, take double that time.
Personally............I always move what I regard as " easily moved " furniture and beds and find the vast majority of clients to be perfectly reasonable in their expectations.