Barrel cleaning advice is more about opinions and guesswork than anything approaching science. Here are a few of my non-scientific opinions:
When starting out with a new hammer forged, chrome lined barrel (e.g., Noveske), JB Bore Paste (600 grit) is very helpful getting all that release agent out of the bore. I'm guessing it simultaneously does a good job of knocking down the high spots in the chrome on a microscopic level. Early accuracy results would indicate so. A new chrome lined barrel prepped like this also stays cleaner than one not prepped. This all indicates to me that JB Bore Paste is a good thing.
I use JB Bore Paste on chrome lined machine gun barrels. Zero issues. It's the only way that I know to get one to even approach being clean.
KG Industries KG-2 is a much milder 1200 grit, non-imbedding polish. A few drops on a couple of VFG pellets will do the same thing as the JB Bore Paste, just in a more gentle manner. This stuff is 100% safe in SS barrels, too, so long as you don't go crazy and overdo it. I've found it useful every few hundred rounds in smoothing out throat erosion and heat checking. This is not unlike the effect of a Tubb "Final Finish" bullet - just lots cheaper! Beware: If you clean the entire barrel with KG-2, it's so effective at removing all copper that you'll lose 50 FPS. It's almost like starting over with a new barrel. But, in 20 rounds, you'll be back in business.