We would often drive from Surrey to Cornwall in the 60s and at the end the front of the car would be covered in insects. Petrol stations en route had water and sponge to wash screens and in the days before self-service, the attendant would offer to clean the screen.
On long trips in the last five years I have noticed the return of dead insects, so maybe the general reduction in the use of insecticide or environmental awareness is beginnng to have an effect. Hope so, because a recent 27-year German study recorded an
insect decline of 76%, and you can imagine how that will have affected bird populations.