I mostly do shotguns, but I can see how a rifle barrel needs to be broken in. The last one I got had big spiral scratches in it from end to end, it took me forever to get them out.
Yeah....... I think folks here are confusing “cleaning” with breaking in a NEW barrel on a rifle......two different critters IMO.
I believe in “breaking in a new barrel” as well as cleaning firearms after each use. Just my habit as career military.