As a follow up to this I wanted to ask if anyone knew whether this slit can be rotated. As you can see this slit points towards the right hand side of the screen instead of towards the middle of the screen where the blades would wipe over it. I am very frustrated by the fact that I can't get the back windscreen clean properly as it seems to spray mainly beyond the arc of the wipers. Seem like a very strange design flaw, is anyone else aware of this and has any solutions.
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