A washer-drier machine for washing and drying the laundry comprising: - a washing tank suitable to contain the washing liquid; - a basket suitable to accommodate the laundry and being rotatably supported within the washing tank; - a washing water delivery system (6, 7, 12) with a plurality of washing flow paths extending from one or more supply electrovalves (6,7), through corresponding compartments (8, 9, 10) of a detergent tray, to the washing tank, wherein the washing flows along said washing flow paths are selectively adjustable via said one or more electrovalves (6, 7), - a drying circuit (16, 17, 18, 19, 20, 21) with a first suction unit (17, 18), an air-to-air heat exchanger (19, 20) and a heating unit which communicate with each other by means of a drying duct, said drying circuit being suitable to deliver a drying air flow through said basket, - a cooling circuit (23, 24, 25, 20, 35) with a second suction unit (23, 24) and said air-to-air heat exchanger (19, 20), wherein said cooling circuit is suitable to intake a cooling air flow from the environment and blow it to said air-to-air heat exchanger (19, 20) to cool the latter, - a fluff-rinse duct that is configured to convey a flow of fluff-rinse liquid to the drying circuit in order to remove the fluff therein, characterized in that said fluff-rinse duct branches off from at least one of said washing flow paths (6, 7, 12), such that said fluff-rinse flow can be selectively supplied by means of at least one of the same electrovalves (6, 7) together with said washing flow path (6, 7, 12), wherein the fluff-rinse duct is connected to the drying circuit in an upper end potion of the heat exchanger (19, 20) and downstream of the heat exchanger (19, 20) with reference to the direction of the drying air flow and one or more primary ducts of the heat exchanger (19, 20) are oriented such that the fluff-rinse flow fed by a spray nozzle in the upper end portion of the heat exchanger (19, 20) passes through said primary ducts from top down countercurrently relative to the drying air flow in said primary ducts, and further characterised in that a suction opening formed within a lower part of the rear wall of the washing tank connects the interior of the washing tank with a lower end of the heat exchanger (19, 20), such that the fluff-rinse flow cleans the primary ducts and carries the fluff through said suction opening to the washing tank bottom from which the fluff is drained together with the fluff-rinse water and condensate. - a washing tank suitable to contain the washing liquid; - a basket suitable to accommodate the laundry and being rotatably supported within the washing tank; - a washing water delivery system (6, 7, 12) with a plurality of washing flow paths extending from one or more supply electrovalves (6,7), through corresponding compartments (8, 9, 10) of a detergent tray, to the washing tank, wherein the washing flows along said washing flow paths are selectively adjustable via said one or more electrovalves (6, 7), - a drying circuit (16, 17, 18, 19, 20, 21) with a first suction unit (17, 18), an air-to-air heat exchanger (19, 20) and a heating unit which communicate with each other by means of a drying duct, said drying circuit being suitable to deliver a drying air flow through said basket, - a cooling circuit (23, 24, 25, 20, 35) with a second suction unit (23, 24) and said air-to-air heat exchanger (19, 20), wherein said cooling circuit is suitable to intake a cooling air flow from the environment and blow it to said air-to-air heat exchanger (19, 20) to cool the latter, - a fluff-rinse duct that is configured to convey a flow of fluff-rinse liquid to the drying circuit in order to remove the fluff therein,