Polishing-washing method

A polishing-washing method comprising the steps of providing a polishing media comprising a powder of at least one of an RB ceramic and a CRB ceramic and bringing a medium stream containing the polishing media into contact with surfaces of a body being worked on to polish the body surfaces, wherein the RB ceramic comprises a carbonaceous material obtained by mixing degreased bran with a thermosetting resin to form a first mixture, kneading the first mixture, pressure-forming the kneaded first mixture, drying the pressure-formed first mixture and firing the dried first mixture in an inert gas atmosphere at a temperature in a range of 700 to 1000° C. and the CRB ceramic is obtained by mixing the carbonaceous material of the RB ceramic with a thermosetting resin to form a second mixture, kneading the second mixture, pressure-forming the kneaded second mixture at a pressure in a range of 20 to 30 MPa to form a workpiece and subjecting the workpiece to a heat treatment at a temperature in a range of 700 to 1100° C. in an inert gas atmosphere.