Cinders: I've never heard this about stainless steel wool. I've had good results on barrels with heavy active rust using various grades of regular steel wool along with a very heavy coating of motor oil or gear oil. On various pieces it has seemed to leave the bluing (or what's left of it) alone. I think the key is having a good layer of oil on the surface. On other forums I've heard people talk about "bronze wool" being superior but no sign of any existing here in any store.
Ridolpho