Fuente: WIPO "rice" A mobile unit for group exposure of equipment to an ozone gas treatment, said mobile unit including: a high capacity fan, a power generator, an ozone generator, an oxygen concentrator; an ozone level monitor; and at least one of: (i) a standing rack; and (ii) a rotating rack, each rack designed for holding a plurality of individual equipment for treatment. A method of using this mobile unit for bulk cleaning treatments is also disclosed.