There's a really irritating leak from the top of the washer bottle. I'd removed the bloody thing and cleaned out the level sensor (because I thought that was grotty when the warning light came on) but it turns out the warning light comes on for the right reason - the fluid is low!
Turns out it is leaking from a "dimple" in the moulding on the underside.
Tedious.
2018690620 seems to be NLA at the dealer and second hand ones seem to be about 20 euros so bugger that! I might as well try and fix the little crack.
I don't know if the following fix will work but this is what I've tried.
Super glue.
And because I'm back in Holland at the moment - bicycle inner tube patch (yes normally I'd use a rubber contact adhesive but I don't think it will glue onto the ABS plastic)
I'll let you know if it turns out to be leak proof...