plastic polished

The scratches are commonly called swirls and occur in surfaces that have been polished using a circular motion resulting in very fine scratches in the polished surface. You can see them on cars where they have been polished in that manner.

To replicate it, I would try and do something like that in a clear coat, leaving the surface underneath to reflect the background. You will of course need to use a shader that can render a clear coat.

You can make a set of concentric scratches fairly simply :

Then use an FX-Map to iterate those scratches each in a random position (use random functions on the position in the quadrant node)

Then you can tile further if required and use it to control the normal map, and colour, of a clear coat.

Rough and ready, but hopefully it gets you started down the right lines.

Dave