Wiper blade for the cleaning of vehicle windows, with: - at least one wiper blade body extending in a wiper blade longitudinal axis, with at least one wiper rubber, having at least one wiper lip, on the wiper blade body, - at least one wiper blade adapter for a mechanical connection of the wiper blade with a wiper arm adapter arranged on a wiper arm, wherein the wiper blade adapter has an adapter element on the wiper blade side and an adapter element on the wiper arm side arranged such that they can be pivoted with respect to one another in an axis, and - with at least one nozzle opening provided on the wiper blade, which is able to be connected via a fluid connection on the wiper blade side with a supply system on the vehicle side for supplying a cleaning or washing fluid, - wherein for connecting or releasing the mechanical connection between the wiper blade adapter and the wiper arm adapter at the same time also the fluid connection is produced or respectively released, - wherein the wiper blade adapter is able to be releasably connected with the wiper arm adapter in a direction at least substantially perpendicularly to the wiper blade longitudinal axis, - the wiper blade adapter consisting of an adapter element on the wiper blade side and of an adapter element on the wiper arm side, which are arranged swivellably with respect to each other, that the two adapter elements (17, 18) are connected with each other via a hose connection (25; 25a), and that the hose connection (25; 25a) is connected on the adapter element on the wiper arm side with a fluid connecting piece, which has a connecting piece attachment running perpendicularly to the wiper blade longitudinal axis on the side facing away from the hose connection (25; 25a). - at least one wiper blade body extending in a wiper blade longitudinal axis, with at least one wiper rubber, having at least one wiper lip, on the wiper blade body, - at least one wiper blade adapter for a mechanical connection of the wiper blade with a wiper arm adapter arranged on a wiper arm, wherein the wiper blade adapter has an adapter element on the wiper blade side and an adapter element on the wiper arm side arranged such that they can be pivoted with respect to one another in an axis, and - with at least one nozzle opening provided on the wiper blade, which is able to be connected via a fluid connection on the wiper blade side with a supply system on the vehicle side for supplying a cleaning or washing fluid, - wherein for connecting or releasing the mechanical connection between the wiper blade adapter and the wiper arm adapter at the same time also the fluid connection is produced or respectively released, - wherein the wiper blade adapter is able to be releasably connected with the wiper arm adapter in a direction at least substantially perpendicularly to the wiper blade longitudinal axis, - the wiper blade adapter consisting of an adapter element on the wiper blade side and of an adapter element on the wiper arm side, which are arranged swivellably with respect to each other, that the two adapter elements (17, 18) are connected with each other via a hose connection (25; 25a), and that the hose connection (25; 25a) is connected on the adapter element on the wiper arm side with a fluid connecting piece, which has a connecting piece attachment running perpendicularly to the wiper blade longitudinal axis on the side facing away from the hose connection (25; 25a).