I think we need more info.
Are you talking about on the rotor hats? If so, pull them off, wire-wheel them clean (as mentioned above) and paint them. Although I'd think your OE rotors would be coated.
If you're talking about the rotor's braking surface...well...you can't be, because I know this isn't your first car. The braking surface will develop surface rust after a couple days of being parked. That's 100% normal. There is no "solution", as their is no problem. Drive the car and off the rust comes. All cars with iron rotors experience this if not driven daily, especially in humid/rainy climates.
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