The best thing I have found for cleaning jimps, is 600 greaseless on a cotton wheel.

If they are very rusty, the razor needs to come apart to properly clean, because the tang at the pin is also rusted.

Here is a good link to restoration, (Welcome to the Workshop: How do I / Where do I / What do I / answers are here), the library / razor restoration has more info.

Photos are always a big help in offering advice.