Patrick, I can attest to the success of the acetone/ATF mixture. I mix about 6 oz. at a time and keep it in a sealed pickle jar (I don't think it had to be a pickle jar, but that was the cleanest one I found in the recycling bin) I used some today. mixed months ago. Minimal torque required to break a nut loose, on a steam engine that's been out of doors most of it's 142 years. (See my thread about chores completed in the off-topic forum)
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