I went on a course a couple of weeks ago at Leicester run by Steve Carpenter.
It was hands on and we used an oreck orbitor, low speed rotary with black XR scub pad,
1200 psi extractor with a spinner and vac attatched and a trucmount on full heat with the spinner.
There was no difference in quality of work from any of the machines, a wet vac was used to pick up slurry from rotaries.
A second hand rotary and wet pick up could be used, so set up cost could be from a couple of hundred quid.
Lots of stone floors around, its just getting customer to have it done, most commercial will expect cleaning staff
to mop, its up to us to sell and demonsrate the differance in quality from a mop.
Andrew