Wet Carpet - know the route of rear screen wash?

[VPMD7A]

Getting soaking wet carpet on the rear passenger footwell (drivers side) . I'm half suspecting a leaking rear screen wash pipe (estate) as the car has had a new rear wing.
Anybody know an easy way to find the pipe??? (I can see it in the rear wing compartment)

Thanks

 

[VPMD7A]

Ahhh!!! I noticed and fixed that at the weekend but just couldn't beleive the water would run to the rear footwell when the front was virtually dry. Thought it must be something else!
Thanks for that.
Iain