I cut the tops of some kegs to make kettles out of. The area of the keg that wasn't filled with water is tarnished from the plasma cutter. I've been scrubbing on it with soapy water and a soft sponge and while I"ve gotten some of the tarnish off I think I've hit a wall. Any tricks out there about dealing with this?
I like that barkeepers friend its mint! I also suggest before using a plasma cutter fog well the inside of the keg with anti spatter welding spray, then fill with as much water so you don;t have it blowing back out at you. I have found that you get less or non of the tarnishing as you described. If you have the capability waterjet cutting is awesome, I have 3 out of 4 keggles cut in that fashion. The cutting medium garnet leaves a sandblast clean finish within the kettle.