Tanker vehicle with integrated tank washing head and method for emptying the tank of a tanker vehicle

A tank vehicle (10) comprising a tank vessel (20), which has at least one outlet (21) for emptying a product (50) from the tank vessel (20). According to the invention, at least one tank wash head (30) is installed in the tank vessel (20), by means of which a rinsing liquid can be introduced under pressure into the tank vessel (20). This tank wash head (30) can be used for cleaning and/or emptying the tank vessel (20). Also disclosed is a method for emptying the tank vessel (20) of a tank vehicle (10), wherein during the emptying process at least temporarily a rinsing liquid is introduced under pressure into the tank vessel (20) via a tank wash head (30).