Hi Rob @robdomenech ,
The spots can be made with a Voronoi and Color Ramp (new 3.6 spelling).
For those lines, have a look at: https://cgcookie.com/courses/shader-forge
Specifically the Brushed Metal and the Marble lessons.
Another article that is very useful (if you have a bit more time) is by Blenderinsight: “Procedural wear from A to Z in Blender”
(it’s under his “Knowledge base nodes”)
