Surf-n-Turf, rotors will get a very light coating of rust from water spray while washing the car. The rust film on the rear rotors makes a shrill squeal when braking in reverse for a short while afterwards, otherwise no after-effects. If the rust film on your rotors isn't too thick normal driving should clean them; however, if it's a thick build-up you might want to hold emery paper against each surface (front and back separately) while rotating the rotor so they clean up evenly.

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Fred Hoelzle