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I must confess to a continuing puzzlement regarding the cleaning the brake disc issue.
The arrow in the picture points, as far as I can tell, to the actual friction surface of the rotor, and you do not want to be spraying much of anything on there, rusty or not. The first time you push on the brake pedal, the rust should be gone by the scrubbing action of the pads.
On my car, it is not unusual for a little discoloration ("rust", if you like) to develop if some water splashes on the rotor surface as there is, obviously, no rust protection on that portion of the rotors. Again, the action of the brake pads clean that up in a hurry.
I can well imagine that a damp climate would lead to quicker rusting of the rotors if the car is unused, but then that's another excuse to take it for a joy ride, eh?
"Sorry, honey, can't scrub the carpet today, I have to scrub the brake rotors on the Porsche instead."
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