The problem you have sound as though it's a slightly more serious version of my experience.
The water jet to the rear screen should point directly up, and spray through the cut out in the plastic cover that covers the securing nut for the rear wiper. The tube from the elbow on the motor runs through the blade drive. Corrosion occurs within this tube, snags the tube, effectively blocking it.
Yes the peugeot part will cost you an 'arm and a leg', and the cheaper option is to dismantle it all, and give it a good clean. Grease up the blade drive tube to prevent re-occuring, which it will do, due to the nature of strong screen wash. The clue that it's beginning to stick, is when the water jet starts following the blade arc.
Hope this helps
Mick
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