A cleaning system for cleaning a band circulating in a paper making machine; the system comprising: - at least one detecting device configured to detect at least one parameter indicative of the cleaning conditions of the band on at least one portion of the band; - at least one cleaning device provided with at least one nozzle to create a jet of a cleaning fluid; the nozzle being arranged so that the jet of cleaning fluid is directed towards the band; - a control device configured to regulate the cleaning device on the basis of the at least one parameter indicative of the cleaning conditions of the band; - a first moving assembly configured to move the detecting device along a direction transversal to the circulation direction of the band; the detecting device being active during the movement so as to detect a plurality of parameters indicative of the cleaning conditions of the band in different portions of the band; - a second moving assembly configured to move the cleaning device along a direction transversal to the circulation direction of the band; the cleaning system being characterized in that the second moving assembly comprises: • a second moving device; • a second carriage moved by the second moving device and coupled to the cleaning device; • a second guide configured to guide the movement of the second carriage and extending along an axis substantially transversal to the circulation direction of the band; • a supporting frame supporting the second guide; the supporting frame comprising two substantially identical uprights coupled to the second guide, resting on the floor or on an appropriate support base at the sides of the band; wherein the second guide and the uprights define a bridge structure over the band. - at least one detecting device configured to detect at least one parameter indicative of the cleaning conditions of the band on at least one portion of the band; - at least one cleaning device provided with at least one nozzle to create a jet of a cleaning fluid; the nozzle being arranged so that the jet of cleaning fluid is directed towards the band; - a control device configured to regulate the cleaning device on the basis of the at least one parameter indicative of the cleaning conditions of the band; - a first moving assembly configured to move the detecting device along a direction transversal to the circulation direction of the band; the detecting device being active during the movement so as to detect a plurality of parameters indicative of the cleaning conditions of the band in different portions of the band; - a second moving assembly configured to move the cleaning device along a direction transversal to the circulation direction of the band; • a second moving device; • a second carriage moved by the second moving device and coupled to the cleaning device; • a second guide configured to guide the movement of the second carriage and extending along an axis substantially transversal to the circulation direction of the band; • a supporting frame supporting the second guide; the supporting frame comprising two substantially identical uprights coupled to the second guide, resting on the floor or on an appropriate support base at the sides of the band; wherein the second guide and the uprights define a bridge structure over the band.