It's a ConspiracyYou've all got it wrong! The spotty part of the windscreen is due to faecal deposits by insects because you lot don't respect your cars and keep them clean. 'But the deposits are too evenly spaced to be crap!' I hear you ask. Here's proof positive of an insect depositing crap evenly:
'What causes this highly patterned behaviour?' I hear you ask again (I have good hearing). Allow me to provide you with more proof positive: The following is a carefully collated grid map of UFO appearances across the globe, linking them to our magnetic field. Note how the appearances follow a regular pattern of spacing:
Because the radio emissions through the windscreen are of a much higher frequency than the Earth's Ultra Low Frequency (ULF) waves, the corresponding wavelength is only a fraction of the size and correlates to the spacing of the spots of insect crap.
If you are one of our despicable unhygienic drivers, then you will also be prone to imposing an acoustic influence on your swarm of insect crappers. Pay special attention, you outack NSW and QLD types in particular. If you tune to Country or Western (or both!), these little insectoid anuses will line up and start boot scooting, again causing the regular pattern of spots.
Insects behave much like UFOs - some fly, some glow at night, some change colour, some invade your body and deposit their eggs in your brain. This is yet another reason why you should wear tin foil helmets under your tupees - so clean up your acts and be very very careful!
Case closed.