The color you see on the stator (outside) and rotor (inside) is the insulation of the the wires used for both. If you try to be aggressive when cleaning, you could cause a spot for a short circuit to happen.

Best is to have someone that rebuilds electrical look at these. They will have proper tools to check everything and if needed, rewind and repair as required.

If you do try to clean them, then used something very very non-aggressive so it won't eat the insulation off the wire. If Dixie are doing the job, then send it out to them . . .

Hope that helps . . .

Cheers

Mark