Abstract: A method of cleaning plastic chips includes introducing a mixture of plastic chips and water to an in-feed of a housing. The mixture of plastic chips and water is impelled from the in-feed within the housing and agitated so that debris on the plastic chips is abraded by adjacent chips and agitators until substantially all debris has been removed from the plastic chips. Water and debris are discharged through a screen to a debris discharge. Cleaned plastic chips are discharged to a plastic chip discharge that is further from the in-feed than the debris discharge. Chip discharge takes place when the pressure of the plastic chips at the plastic chip discharge exceeds a threshold.