Alternatively you could accept that this "very minor sign of corrosion" is a nice bit of patina that shows your car is ageing nicely, do what you can with protective waxes to slow the advance as much as you can, and just live with it happily by standing a bit further back from the car when you admire it. That's what I do with my car.
That's the way I try to go, even if it doesn't always work emotionally, but most of the time it does. There are quite ugly rust bubbles between the running board and the bottom edge of the door. You can't just remove it and experts told me it would keep coming back. I don't know if it's true or not. And you would have to remove all four wings in my case too.
