2012 Boxer Windscreen Scuttle

This may be a daft question but does anyone know of an after market part that fits between the top edge of the bonnet and around the windscreen wipers that would prevent the build up of leaves etc as its a real pain trying to get various bits of rubbish that seem to collect on top of the scuttle cover?

Not heard of anything specific but my windscreen cover goes over the scuttle and prevents any ingress of leaves etc.

I have recently had a similar problem. The scuttle panel (as you call it ) is easily removed.
First carefully lift and remove the rubber strip just below the wipers.
Then remove the wiper blades followed by wiper arms, make sure the arm doesn't smack 
against the screen.
Next remove the various fixings and note they are not all the same.
Then lift off the plastic scuttle. Clean the whole area and ensure that the rainwater exit
gulley is clear (mine was blocked and why I did the job)
Re-assemble in reverse order with a little drop of 3 in 1 on the screw threads.
Wiper arms back on and wipe the blades before re-fixing them. took me about an hour but
was easy to do and well worth it for peace of mind.
Have fun
Mike