Quote:
Originally Posted by Refugee
A long soaking in car engine oil is quite a good way of getting hardened grease off.
It contains an additive that keeps internal engine components clean and it also works on hardened grease.
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Old-type automatic-transmission-fluid [ATF] is even better, because it has higher 'detergency' than engine-oil. It's also thinner, so it creeps into difficult places faster and more-thoroughly.
[I have an AR88 tuning-gearbox pickling in a bucket of old ATF as I speak]