Our very-roughed textured porcelain floor tiles in the kitchen have always been a problem to keep clean; the irregular slate-type surface seems to catch dirt in all the little grooves. Before the purchase of the Gloss Boss, we resorted to hand-scrubbing with a stiff brush, followed by mopping---too much work! We now let this inexpensive machine do the hard work and after a quick pass with a clean sponge mop the floor looks new again.