Plasticiser film?
 I read the study
I haven't, but when I'm driving I can see bike lights. I can see steady bike lights and flashing bike lights. I haven't seen a light of any kind and thought "I er don't know how far away that is I fink I'll drive into it" and I haven't seen any reports of that happening.
@vickypea it's that kind of greasy grey opaque coating that builds up on the inside of your windscreen from the slow decomposing of the plastics in your car. Or something like that.
A good dose of screen cleaner and microfibre cloth sorts it.
On a cold sunny morning it looks like the screen is misted up.
But no amount of hot air will clear it.
I'm sure that the above is not the most technically accurate description! the
Thanks garage-dweller. That sounds horrible but presumably we aren’t being harmed by inhaling them? Or are we?!