Back in Australia, We used a spinner day in, day out cleaning all sorts of natural stone/porcelain/exterior sandstone and it worked a treat. Had it running off a truckmount. Obviously the spinner has its place amongst all the other kit in your van for a specific job, but its great for easy cleans to large areas. We used it especially for large exterior sandstone jobs on new builds but also got it out quite often for some larger interior limestone jobs to neutralise/rinse