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Most likely the pump (motor) is gone and needs replacement. However, it is worth checking that fuse allocated to windscreen washer is intact. Furthermore, you may also need to check the wiring for flow of current at lever end (handle on the steering wheel) and wires connecting to pump on the water reservoir.
If you can hear the washer motor running when you operate it then the fault is most likely caused by a small filter for the washer pump inside the bottle that blocks up.
You will need to remove the washer bottle and clean out the filter.
Over a period of months the flow from the washers on our 2003 307 gradually reduced until there was nothing although the bottle was full and the pump could be heard. After removing the right front wheel and the inner mudguard liner the bottle can be removed. The pump unclips from the bottle. The pump has two outlet ports. Clipped into the ports is a small cylinder with spouts for the front and rear washer hoses. The pump runs forwards or backwards for either the front or rear wash. Inside the small cylinder is a rubber cylinder in a plastic tube which is a shuttle valve to isolate the two circuits. Over time the rubber cylinder had expanded in length and blocked both circuits. I shaved 1 m.m. from each end and now it works like new. You need to be a bit handy and be careful not to break or bruise any plastic surfaces. A Haynes manual is some very basic help.
Fords have a common problem with their washer pumps. for the last 12 years ford have fitted a plastic mesh over the inlet to the washer pump, this blocks up with the build up of crystalized washer fluid. fords official protocol says to use a small sharp object the size of a pencil to peirce the mesh and allow the flow of water. Also most washer bottles can be accessed via the front wheel arch. simple undo the fixings and pull the innier plastic wheelarch out the way and pull the pump out of the bottle. they are never fixed in just wedged in.