MetalMaster is a very nice vendor, I trust him a lot.
A light touch with a belt sander then I polish the scratches out with sandpaper
At work did not use them, at home I'm with you Mucho like copper bottoms
Since I had file marks started with 100, 120, 150, 220, 320. It worked for me have no idea what the pro's here use.
At trotter's they used all copper pots. As the staggier I got to wash and polish all of them every night I was there