What does your buddy clean his rotors with, I wonder??
So many types of rotors.
-Metallic, Semi-Metallic, Composite Carbon-Fiber, Ceramic, etc.
-Zinc-Plated, Cadmium-Plated, etc.
-Flat Disc, Drilled, Slotted, Combo Drilled/Slotted, Vanes (directional/straight), etc.
-One-Piece, Two-Piece, "Floating", Hub/Rotor Assembly, etc.
As has been mentioned:
-Clean any anti-corrosive films, including cosmoline, oil/phosphate-based, off new/replacement rotors...I've used IPA, and non-chlorinated brake cleaners like Brakleen's NC for their removal. Or rust-removal for vehicles hardly driven and have probably been setting outside/moist conditions.
-Most brake rotors are "self-cleaning" while driving/stopping.
-Won't harm brake pads/rotors/calipers if you get some car wash shampoo on them.
-Don't spray brake cleaners, and most other "cleaners" directly on rotors/calipers/brake pads, even if the wheels have been removed. Spray some on a soft cloth and gently rub the rotor, if you feel it's necessary. I don't.
-Many types of rotors can't be re-surfaced.
-Also some "cleaners" will wreak havoc on hub seals.
-Be very careful using "chemicals" around your brake systems...
"The life you save, just may not be just your own"!!!
Bob
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