Before UFC stud Paige VanZant mopped the floor with the competition ... she mopped the floor with actual mops -- for her role in a cheesy TV commercial.
TMZ Sports spoke with the undefeated UFC phenom ... who revealed she was a child actor back in the day -- and actually scored a lead role for a Bissell steam mop ad.
Good news ... we found the commercial!
By the way, Paige says she'd love to do even MORE commercials in the future -- so we had to ask, are you worried about damaging your face in the Octagon? Her answer is awesome.