lots of stuff out there will remove bluing,,,for around here I simply use naval jelly or any of the rust removers for farm stuff...muriatic acid but a very mild solution like 2 to 5 % you do not want to "etch" the metal, you can then just wipe the metal down with an old 3M scotch brite pad to burnish it up nice, OR polish things up,,,I stay away for power equipment these days ( no dremel tools and buffing wheels) 3M stuff is our friend.................yes I even still have one on the bench grinder for cylinders, barrels and housings, if "needed" 8) :roll: :wink: