Help needed with my windscreen washers

Hi everyone

I am having problems with my windscreen washers. The rear haven't worked for ages (neither the wiper or the washer) the front however, were struggling to produce much of a spray and now I can't get any water through at all - the wipers work fine just no water to clean them - I can hear the motor sounding but nothing coming through - I did think that they were perhaps blocked so I bought a can of compressed air and blasted it through from the tube having disconnected it from the nozzle - I could hear the water bubbling in the water reservior so I know that it isn't blocked. with the tube still disconnected from the nozzles still no water.

Any help would be appreciated.

Thanks

Joanne