That video exemplifies how easy it is to impress and fool a OP cleaner.
Scrubbing Tile and Grout with a d'limo pre spray (and running?) will provide "noticeable" results but will be nowhere (NOWHERE) near as clean as when a Turbo Hybrid has been used to EXTRACT deeply embedded soil from WITHIN the grout.
I'd love to come by for FREE and put a big giant clean "X" on that floor after it was OP'd. It's one thing to be uniformly soiled and another thing to be clean. "Clean" in the English language would needs to be properly defined. We seem to have multiple definitions here.