I guess some of these portable manufacturers have convinced them. IMHO, that's "Mighty-Bad"!
The liability is present and the possibilities of damage can be unbelievable!
Years back, I interviewed 5 contracting firms who only did stone/tile installations, and cleaning. They were all in line stating their experience: Use a rotary (mechanical action), and a low psi rinse to help flush surface.
My own experience shows that they were right on.
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