Hi ramz,
Been through this several times - pin to clear jet, air line to clear fitting round wiper spindle etc. - works for a few days and blocks again, and again.
Found problem to be dirt/contamination in resovoir and pipe work. Drained washer resovoir, cleaned it out well, refilled with plain water, removed pipe from rear jet and directed it into bottle, operated pump and pumped through about a litre - amazed how much rubbish came out!
Refitted all parts, filled resovoir with screen wash - fault cured! (been ok months now)
If yours blocks again try the above.
All the best Mac.
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