In this video, Dustin Valkema walks us through his workflow on applying realistic smudges to materials in Cinema 4D and Redshift. Smudge textures are a great way to add photorealistic qualities to your materials by introducing surface imperfections. Whether subtle or intense, these processes are great to know!
Though this tutorial is in Cinema 4D and Redshift, the same principles apply to any 3D software you may be using.