How can ordinary polishing work produce highlights?

Hello, we usually use machine polishing, wet grinding first, coarse grinding to remove burrs first, then medium grinding to smooth the surface of the workpiece, and then fine grinding, using high-frequency porcelain; if this still works No, you can only use a dry barrel polisher and polish slowly, usually for more than eight hours. This is the so-called fine workmanship.

Thank you! Hope it will be adopted.