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I’ve had luck disolving scale with CLR — it’s essentially Lactid Acid and is good at dissolving salts – rust, aluminum oxide, lime scale for example.
Have you opened the crankcase and separated the jug ? If so, soak the jug in full-strength CLR for a couple of hours at a time, pull it out and dunk it in fresh water, repeat until you don’t have junk in the water.
Caveats: The CLR is likely to have a galvanic reaction with the cast iron, and you’ll end up with black iron oxide on your jug. No point in removing it from the water passages — it actually creates a layer of dead zone that will resist rusting. However, it can be hostile to paint — dulling the top layer.