For wet floor scrubbing or heavy-duty spray cleaning with a swing-arm or autoscrubber rotary machine, use Prime Source BLUE Cleaning Pad, 13 inch diameter on machines up to 350 rpm. The blue Prime Source rotary pad can be used to aggressively clean heavy dirt and scuff marks on certain types of resilient floors such as vct. Check your flooring manufacturer instructions for cleaning before using this type of machine pad on the floor to ensure it is compatible. Buy 5 or more 13-inch blue rotary machine pads and save! Machine pads are sold individually. The blue scrub pad is only available in the 13 inch size from 1877FloorGuy.