This is flotex, after pre-spraying, flooding and scrubbing. The funny coloured swirls are all the dirt that is picked up and washed to the top (lighting/camera makes it look a funny colour). About 200L of water went through this, 50L of which went on prior to extraction. Two identical areas roughly 40m²each, ground floor/first floor common areas in a school, took about 90 mins per area. First one cleaned was dry by the time the second was finished.
Skimming the top with a rotary is all very well, it will produce a superficial improvement, but if you'd have done this afterwards it would have been like you'd never touched it.