Easiest way to clean the surface rust off your brake rotors is to take the car up to 60 and then brake sharply and firmly, as if you were making an emergency stop for an animal running into the road, for example. Obviously, you want to do this with due caution in an appropriate time and place. Best to let off the brakes at about 10 mph, before coming to a complete stop (unless you really need to stop of course). On the county highways where I live, I get to do this for real from time to time (it was sandhill cranes today), and you can really feel the friction brakes working. Not something you want to do every day, but once in a while cleans and quiets the brakes. Otherwise, in normal driving, regen is doing 99 percent of the braking, and the friction brakes don't get used enough to wipe the surface rust.
Last edited by 60Hertz; 07-08-2020 at 11:23 PM.
Reason: added detail