corrosion on MSD reluctor

If the dist is out of the car. You could be bit more aggressive with it.

I would first get a toothbrush and some WD 40 or other light oil and see if you can remove the bulk of it.

You could always try mild acid but I would be very carefull with that as who knows what the pickup can handle.

If it is off the car I would do everything with the dist top pointing down to refuse the contamination from getting into the rest of the dist.