Headstock clean-up

[stevec]

Update, Well the diesel fuel doesn't seem to cut it. The heat seems to have softened it so that where the stream from the pump comes out the sludge gets moved but it's definitely not getting disolved/absorbed.
I could probably get it out with some sort of heated pressure washer but I don't want to shoot water of any sort into the headstock for fear of rusting places where I won't be able to remove the water.