I have tried 3 products...................Cimex, Von Schrader and Chemblend. The V / S gets an excellent result and seemed to have more cleaning power. The Chemblend gets an excellent result also and only costs about £5 for 5 litres. The Cimex product has similar claims to the v/s needs more work.
From the reports on the Canadian / American sites I'm sure they have more advanced products and the o/p method has indeed been around for years.
I imported a little machine about 10 years ago, but it was too light.
There is a 15 " machine which I'd love to own because of it's weight. I'm no weakling, but my back must be given a break and that machine / system would be a lot easier to use .
There's a little stair/upholstery tool that might just appear soon. I tried to import it, but was told they were involved in negotiations with a U K company !!!!!!!!!!!!
However...........................there could be a twist in this tale !
If you imagine the Oreck with grab handles, like a polisher, it,s similar to that, but I think slightly heavier