Device for cleaning windscreen on automobile

The device has two windscreen washer jets (4,5) and a rotatable reversible pump (11) having two outputs (2,3) capable of selectively supplying washing liquid towards the jets along a pump which either rotates in one or the other direction. The exits of the pump are each one connected to one of the jets, and the device equally has electrical control members (6-14) for, during one washing cycle of one of the window surfaces, controlling alternatively the pump in on direction or the other at a pre-determined half-period.