First step is to identify the location of the fault.
When you try to spray, can you hear the motor?
Remove the boot panel covering the location of the sprayer, to get to the fluid hose leading to the spray.
Remove the hose from the plastic attachment - the spray input.
While the hose is removed get someone to try the washer - see if the water/screenwash is coming through this far. If so, probably have clogged nozzles.
Had same issue on screen washers, and got two new bonnet0mounted nozzle fittings from a breakers yard for £1. Problem fixed.
SM, April 2009