Bear with me on this, just a thought . . .
My first c3 pic (2009) suffered from the problem of the water from the washer bottle working its way into the engine bay fuse board, so it had no sidelights due to the corrosion.
I've just bought a 2012 c3 pic which has not been affected by this problem.
I'm thinking of putting a couple of silica gel pouches under the fuse board cover to reduce any moisture that may find its way there, so hopefully avoiding the possibility of the previous problem happening.
What do you think ?