Stopped up nozzles.

Another possibility is the motor in the Washer Fluid jug could be burned
out. If this is the case it can be replaced with an aftermarket
replacement. Generally the motor is fitted right into the jug, and is held
by a good seal. Getting at the jug can be a little complicated.

Another possiblity, although less likely, is the switch in the wiper
wand/level, is broken. This can be test by getting to the wire connector
for the Washer Pump.