I reckon the reason for the plastic pipe must surely be a return to the dealer when it chafes through and a tasty bill that would surely follow helps their coffers nicely. I’m just pleased I found the leak by removing the undertray and not the bumper.
I now have fully working washers and so far appear to be leak free.
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2011 Volvo V60 D3 SE Lux
1999 V40 T4 (In limbo )
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