welcome,
how do you think that grand canyon was made? add some water and abrasives. it took alot of time, but thats all you need.
chances are your guns will outlive you and once you are dead, i seriously doubt you will care.
But ive been using bronze and ss and nylon brushes on my guns.
when i was young and only had a handful of guns i use to clean religiously. That is after each outing, i would clean all guns shot no matter the round count.
now with alot more toys i dont clean as often. Sometimes i will take out a friend and let the test drive my toys. Most of the time its only a few mags through each gun. I dont clean them for that low of a round count. So i may do it after several outings. Its just how i do things now. If im taking a toy out, i will field strip it and wipe down the rails and give it some lube, but thats about it.
I will also inspect the bore, but again, after 2 or so mags, not alot of dirt. Ive been switching to jacketed/plated bulllets so leading isnt as much an issue and the need to be aggressive with the cleaning is not needed.
im sure others will do differently, but really its up to you to find how you like to do things.
one this about brass/broze. in my M1 i will use the Shooter Choice? but the one that has ammonia in it and that will attack your brass/bronze. So that is where i wont use brass/bronze.