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FWIW I used a big brass brush wheel to clean my rotors. Brass is perfectly safe on iron parts. MEGA CLEAN ROTORS!!!! For the tiny spots and edges, I used a Dremel with the paint stripping bits. They are kind of like hard sponge, and come in different colors. Finally, for grooves and other crevices, I used carb cleaner and old seals.
It's somewhat therapeutic cleaning rotors...
PS
Don't buy into the myth that using a brush will wear the cadmium coating on the rotor. That was temporary for a long time ago when the rotors were first made and they sat on shelves... Some people don't seem to realize cadmium has a lower melting point than lead. The coating is long gone by now.
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