Cooking oven comprising: - a cooking chamber wherein foodstuffs can be placed for being cooked, comprising an upper wall ; - a heating device for heating the internal of said cooking chamber ; - a suction wall separating said cooking chamber from a heating chamber containing, at least partially, said heating device ; - a centrifugal fan , positioned in said heating chamber and configured for circulating an airflow through said cooking chamber and said heating chamber ; wherein said suction wall comprises a suction mouth facing a central region of said centrifugal fan , wherein said cooking oven comprises: - a cleaning system comprising a washing/rinsing liquid introduction system configured for taking washing/rinsing liquid within the cooking chamber and provided with an outlet positioned in said upper wall of said cooking chamber , wherein said cooking oven comprises: - a diverting element configured for receiving a liquid exiting said outlet of said washing/rinsing liquid introduction system and for spreading it on said suction wall so as to form a liquid film on it, which is taken by gravity into said suction mouth , wherein said diverting element comprises: - an inlet opening facing said outlet of said washing/rinsing liquid introduction system , and - an outlet opening positioned in proximity to said suction wall , characterized in that said diverting element comprises: - a sloped wall configured for guiding liquid coming from the inlet opening to the outlet opening by gravity. - a cooking chamber wherein foodstuffs can be placed for being cooked, comprising an upper wall ; - a heating device for heating the internal of said cooking chamber ; - a suction wall separating said cooking chamber from a heating chamber containing, at least partially, said heating device ; - a centrifugal fan , positioned in said heating chamber and configured for circulating an airflow through said cooking chamber and said heating chamber ; wherein said suction wall comprises a suction mouth facing a central region of said centrifugal fan , wherein said cooking oven comprises: - a cleaning system comprising a washing/rinsing liquid introduction system configured for taking washing/rinsing liquid within the cooking chamber and provided with an outlet positioned in said upper wall of said cooking chamber , - a cleaning system comprising a washing/rinsing liquid introduction system configured for taking washing/rinsing liquid within the cooking chamber and provided with an outlet positioned in said upper wall of said cooking chamber , wherein said cooking oven comprises: - a diverting element configured for receiving a liquid exiting said outlet of said washing/rinsing liquid introduction system and for spreading it on said suction wall so as to form a liquid film on it, which is taken by gravity into said suction mouth , - a diverting element configured for receiving a liquid exiting said outlet of said washing/rinsing liquid introduction system and for spreading it on said suction wall so as to form a liquid film on it, which is taken by gravity into said suction mouth , wherein said diverting element comprises: - an inlet opening facing said outlet of said washing/rinsing liquid introduction system , and - an outlet opening positioned in proximity to said suction wall , - an inlet opening facing said outlet of said washing/rinsing liquid introduction system , and - an outlet opening positioned in proximity to said suction wall , characterized in that said diverting element comprises: - a sloped wall configured for guiding liquid coming from the inlet opening to the outlet opening by gravity. - a sloped wall configured for guiding liquid coming from the inlet opening to the outlet opening by gravity. <EOS>