Fiesta MK6 rear windscreen washer not working

[dodge901]

I've got a 2006 mk6 fiesta and I am having an issue with the rear windscreen washer. The fronts work fine, heres what i've tried so far:

 

- Disconnected the rear jet - no water is coming out the tubing so the jets not clogged.

-Disconnected the front and rear tubing from the pump and swapped them around, The fronts still work whilst connected to the rear outlet and the rear still doesn't work so the pump is likely fine

-Disconnected the first joint going to the rear and the water sprays out pressure so the blockage is somewhere in the cabin.

-Duct taped a hoover onto the tubing to try and suck any blockage thorough - this didnt work.

 

I cant see the headlineing getting wet so i assume the joint up there is ok. Aside from getting hold of a compressor and blowing through the lines is there anything else left to try?