Use free add-on to create realistic raindrops on windows

BlenderViking writes:

Do you want to create realistic looking raindrops on windows in your 3D scene? Then the free add-on Rainy Window Shader might be worth checking out and it is easy to use.

The add-on even has many different options to customize the look of raindrops on windows and I have made a quick tutorial on how to install and use it: