The secret is in the rag. RS Bikepaint recommend (and sell) rolls of a kind of webbing. I've bought similar from autojumbles, and I suspect car shops will have similar.
The idea is that the polish gets in the mesh and doesn't clog, so avoids scratches and works for longer. You can polish out any fine scratches using G4 Rubbing Compound. Give RS a call f you want professional advice
RS Bikepaint