Our Pug 306 (1998) has a blocked washer jet. It has 4 jets from 2 locations (2 jets for each side). 3 of the 4 jets work fine. The other one works fine if you point it right up in the air - if you point it at the windscreen, nothing comes out. It's been like this for a year or so, and that side seems to have problems anyway as the other jet can sometimes block up (it's near side, end of the pipe run).
Peugeot once cleared it with some high pressure jet or something a few years back - but I've had problems doing it myself. I tend to just wiggle the ball jet around until it works.
What do other people do? I guess I could do with something very thin, flexible enough to follow the shape of the tubing/jet, but stiff enough to push through (and not just collapse outside the jet when it hits a corner/blockage).
Thanks
D