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There's currently a thread in GA that mentions the acetone- ATF. ( It's also been posted here previously).
For you heat addicts, there's an old (2003 ) article up on autoinc.org that talks about this subject ( I think that they have it as a link to popular articles -- if not I'll try to find it).
Anyway, this guy claimed that you could heat a broken bolt to make it softer or harder -- depending on if you were going to drill it out or try to get it out. It was an interesting concept.