Abstract: A windshield cleaning device for motor vehicles for use in conjunction with a reciprocable wiper blade, having an essentially trough-shaped receptacle with an inner chamber that is open on at least one side for the accommodation of a water-soluble paste or solid cleansing agent and/or detergent concentrate, mounting means projecting from the receptacle at the side facing away from the at least one open side of the inner chamber for the releasable attachment of the device to one side of the wiper blade, and an applicator disposed adjacent a straight edge defining the inner chamber of the receptacle, which receives from the inner chamber the cleansing agent and/or detergent dissolved by water and applies it to the windshield wiped by the wiper blade.