I'd start with a long soak in mineral spirits and a stiff brush to see if it will come off. I might then move up to turpentine, then acetone if the desired results are not achieved, but first I would apply a drop of each to the back of one grip, let it sit and see how the bakelite reacts to it.
Stay away from Toluol and MEK, which will certainly damage them.
I think long soaking in a mild solvent is the key.
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