Wiper spray bar modification

All you need is Citroen part no. N93780 bx washer jet spray bar from here and a bit of tubing to connect it to the existing pipework. You may also need a connector join the tubing to your existing pipework, a 90 degree joining connector will do the job.

I softened the spray bar in boiling water to straighten out the odd curve at the end, then put it around the lumpy fitting at the end of the S1 wiper using a small tie-wrap at the loped end. Two extra pin-holes and the water sprays the full length of the wiper. Most people seem to put the end of the bar just before the middle of the blade. It's easy enough to take apart and loop around to the top of the wiper instead though, that said even though the arm only covers the bottom of the wiper the force of the wiper moving throws the water up the screen covering the whole window anyway.