And I'll admit, when I last did it, I might have diluted the antifreeze with water. Also, think I ran it for several days. I used to use the crockpot method with wonderful results, just over cooked a good engine once. Switched to Dawn Power Disolver, which works good but now is hard to find anywhere, without buying a whole case.
I know for sure as far as SAFETY. That crockpot once used for antifreeze engine cooking should never be used for food preparation. As well be careful with the fumes that might leak out of it, not good for humans or pets. Don't let pets or children taste the antifreeze, (sounds stupid, but it has happened).