If you look at old photos many cars that had these screens also had a low lip standing proud from the bodywork below and behind the screen or on the edge of the cockpit. The lip is about half an inch and it is supposed to deflect any water being blown back.

No idea if they work...!


Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...