Is the washer pump running?
If it is then it could be blocked jets.
Also, from experience, it could be the intake on the screenwash pump is blocked with crud. If clearing the nozzles doesn't help, remove the pump [emptying the screenwash bottle first :-) ] and wash out the intake. My lad's had a dollop of black sludge goo there which was probably microbial or fungus of some king. Urgh.
XXX, March 2016