I don't know about a preventative measure, but driving it and some braking will remove all that surface rust. My car has rusty discs if I've driven it in the rain and then left the car in the garage for a few weeks. No big deal and nothing to worry about.
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'97 Boxster (Black Hole for 42,000 Dead Presidents and counting) - 122k
New motor, transmission, suspension, and on and on and on it goes...
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