Checking crusty 1 1/2 hp bridgeport winding and rotor

I know this motor is probably no good, but just wanted to learn how to properly check the components. Motor would not turn when it was removed from mill probably because of the build up between the black parts of rotor and windings. Are those black parts magnets? The bearings turn, but not very smoothly. I watched a youtube video on checking windings and did the same tests to my windings. I will post a picture of the results. Can I soak the windings and rotor in evaporust to clean them? I read you are supposed to bake them after cleaning. It is 110 degrees here, can I just leave it in the garage for a few weeks? Any suggestions on checking the windings or rotor are appreciated.

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