a fabric cleaning method uses ozone - bearing cleaning liquid which is spread over the fabric and then vacuumed up . the spreading and the vacuuming are both performed through a cleaning head or tool which has hoses to a vacuum cleaner and cleaning liquid tank . the cleaning liquid is ozonized by injecting air from a conventional ozone generator into the cleaning liquid tank or into the delivery hose . an air pump and / or a venturi in the cleaning liquid line are used for the air injection . the ozone in the air stream dissolves into the cleaning liquid , which both helps to clean the fabric and avoids excessive ozone concentrations in the air . the elements may be housed in a single movable unit .