[Perfectlap]

Get some Michelin Brake Dust Repellent and spray it onto a towel. When the wheels and rotors are cold wipe the Repellent on that center area of the rotor, wheels and the front of the brake caliper. Don't get any on the actuall rotor itself or the brake pads.
With my old car I used to scrubb off the rust from the center rotor with a small wire brush and paint it with a spray can of silver high temp paint and primer using a paint brush. It held up for a couple of months usually.