Abstract: An apparatus and method for producing clean glass aggregate from recycled glass articles is described. The apparatus includes a crushing device, a screening device, and a specially designed screw washer. The screw washer includes an inclined housing and a rotating auger in the housing. A basin in the lower end of the housing is configured to retain a volume of liquid such as water, such that a lowest end of the auger is submersed in the liquid. At least one inlet is configured to inject a substantially upwardly directed current of liquid into the basin. Crushed and screened glass particles received in the basin are mechanically agitated by the rotating screw auger and are impinged upon by the current of cleaning solution, thereby abrading away and separating contaminants from the glass particles. He auger conveys cleaned glass aggregate from the basin to an exit end of the screw washer.