Rear washer jet blocked

[SteakAndAle]

My rear washer jet is blocked somehow - so badly that the washer fluid was escaping under pressure from the wiper motor housing and through the tailgate!

Tried clearing with a pin and compressed air but no joy. I've now removed the rear wiper assembly and opened it up; wiper fluid inside but no major damage. Still can't seem to clear the jet, though - any suggestions? Thinking of soaking it in something, maybe an acid (vinegar/citric) to dissolve limescale. Can't see down the tube though so not really sure what's in there.

If I can't clear it I'll have to replace the whole motor assembly, which seems a shame as otherwise it's in good nick.

If you can't clear it,may I suggest an accessory jet fitted to the tailgate? It's a damn sight cheaper that a new motor assy.

What's an accessory jet? (sorry - google isn't helpful in this case)