Dave,
Twist the gooseneck around...or should I say twist the brush
Or even twist and fiddle with both brush and gooseneck!!
And adjust the plastic angle joint accordingdly, depends on the roof of course, but you'd be surprised at what you can do.
I have the same setup, and I've adjusted the gooseneck to allow me to get into some VERY deepset windows with deep sills (18 inches at least)
Ian