Rotating paddle blasts away heavily loaded or dried and caked on compound. Saves hours of time by cleaning the pad while it is on the buffer. Quickly cleans heavily loaded or clogged pads both wet and dry. A quick spray of water and a couple of passes with the Spin-Doctor instantly rejuvenates pads during the job. Works on convoluted, flat and round foam polishing and cutting pads of all brands. Will not damage pad surface when used as directed.