Your right Geoff,
It would be bonnet. For example, I just completed an office clean polyprop cord carpet with my TM, drying time was quite ridiculous and I didnt feel it cleaned too great, although they loved it. I've looked around and seen good success photos with bonnet cleaning. I just though you spray a solution down after vaccing, and use a rotary at 175 with absorbent pad to clean.
I did do a course this year, but it didnt really dive into each method enough to get a good idea. I've only ever used a TM, never touched anything else.
Thanks Kevin, I will bookmark your site.