I'm currently using the rotovac with tile brushes for my tile cleaning. The disadvantage to this is that I have to use a wand to suck up the water. I'm looking for a tile machine that does both scrub and suck in one operation.
if you use good juice like floor stripper with some oxyblaster, 85% of the time there will be no need for scrubbing. buy a turbo hybrid and blast it with 850-1150 psi and you will have amazing results. (pressure must vary as grout condition and overall floor conditions allow)