Quite possibly, the most productive 20-inch scrubber on the market today The compact, highly maneuverable Clarke® RA40™ Micro Rider Floor Scrubber is designed to take the cleanliness, health and safety of your facility to the next level. From the ultra-sharp turning radius to the onboard chemical mixing system, every cutting-edge floor-cleaning feature has been engineered to the high performance and reliability standards you’ve come to expect from Clarke for more than 100 years