I honestly thought this thing would be shorter. This is why I was speaking of a "Quick-Ish Tip" at the beginning.
Hopefully some of you will still like it and fine it useful!
In this tutorial you will get a basic overview how you can create worn edges and dirt with variation using Octanes Dirt (Ambient Occlusion) or Vertex Maps.
The works best with the newer 2018 version of Octane.
Google Drive link to the scene: