if the spots ARE very tiny, you can
try penetrating oil allowed to stay on surface for
a good while, then use a toothpick to try and dislodge
the rust or a pen eraser. If that doesn't work
you can try some naval jelly.
this stuff also works well
http://www.ppcbest.com/phix_treatment.htm
but of course none of these will remove any pitting
the rust has done.
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