I'm doing a test of how the density of drops of water falling on the glass changes in the wiper swing area. What do you think?

[JanyYZ]

  When the wiper wobbles, if the density of the water drops on the glass is 100%, the density of the water drops on the glass is about 10% or 30% in the area where the wiper wobbles. What are the ways to control the density of water droplets in the middle?