I am trying to polish the barrel of an used CZ 452, it has some stains that don’t go away with tissue paper. Might be rust, might be gunked up dust, I’ve read conflicting informations about how to polish so called “blued steel” barrels. Some say to use Ballistoil on a microfiber cloth. Some say use 0000 grit STEEL wool, “steel wool is softer than blued steel” some other say to use fine grit copper wool instead. The only copper wool I have at hands is the kitchen scrubber type (pic attached)

My plan was to put masking tape on the wooden stock to avoid scratching it with the wool.

EDIT: The CZ manual says: “Never use the agent designed for barrel bore cleaning!

These solutions could remain in the joints, and after some time could cause corrosion. Check that cloth particles or brush

bristles have not become lodged in any part of the rifle.

The maintenance of the stock can be carried out with a dry cloth or by some furniture-polishing product.”