I've always had problems with the windscreen washers on the Trevi.
They didn't work at all when I first got the car so I replaced the washer pump. Halfords have a pump (meant for a Ford Escort I think) which is almost identical to the Trevi's except for the electrical connector which comes out of the top of the pump instead of the side. But it fits fine as long as the pump is fitted horizontally.
Even though the new pump is very powerful, I could not adjust the washer jets to clear the grill on the bonnet and wash the front windscreen; the water jet would either hit the plastic grill or washed the rear screen!
So I used a dremel to take off part of the plastic grill so the washer jets could be adjusted to wash the front screen.
But the washer nozzles kept moving and there was dirt inside them that kept blocking the holes. I could get the windscreen washers to work just long enough for the MOT test but whenever I needed to use them they refused to play ball. So replacement was the obvious solution but the Trevi washers (mounted on metal platforms) are very tall.
Short, standard washers would never clear the plastic grill.
(Trevi washer on the left and new standard and much shorter washer on the right)
But with a plastic nut meant for number plates (which has the correct thread for the new washer) plus a plastic washer the new washer nozzle was extended to be as tall as the Trevi original.
And it stands proud on the Trevi's washer platform
Held tightly in place by the new and slightly thicker pipe.
It works great and I think it looks the part too
(This is what happens when we have too much free time during the holidays! Some of us spend hours playing with windscreen washer nozzles....
)