I agree, that little bit of surface rust is no big deal, has probably occured in the past 5 years, and similar happened to it back in time before. Just put oil on it (don't let the oil be so thick next to the wood that you'll stain the wood) and wipe it off after every handling session with a cloth rag. Remember the rust that comes off is abrasive, turn your rag often, use oil on it.
Extreme methods like boiling, steel wool, acids, bases, needle guns....are what ruins guns. Not a touch or red powder that oil will remove in a few sessions.