Interesting read. I had a rusty nut round out on me when I was trying to get the muffler assembly off for my hitch installation. Looks like I'll hit it with the 50/50 ATF/Acetone mix and try again with one of those nut grabbing tools.
No pun intended...
I HATE the fact that stuff rusts out on cars. Rusty nuts and bolts can turn a quick job into a serious headache!