I just received this piece of blued steel, a new part for a rifle. The part has a complete coating of light oil, and was wrapped up. Those splotches you see that look a bit like hard water spots do not rub off or rub out by an oiled patch. I have the same thing to a lesser degree on the side of the receiver of a new rifle I just received. On the pictured piece, a couple of these areas have an almost rust color to them.
What are these stains? How did they get there? How do I get rid of them? Should either the pictured item or the rifle I mentioned be returned for refinishing?
