Tiny rust spots from nearby grinders
i get this some times when i am using a steel drill on the stainless on deck. did you try the sea-brite or similar name rust remover. it works for me. i have a bottle on board if you want to try it on a spot
the end of the month.
did i tell you that my friends shoes set of the explosive detector at the airport after working at independant boat yard in the rain last november. eric