For the record, I take back EVERYTHING bad I said about Kroll oil. The stuff is magic! The smell (which does smell like simple green to me) does disappear in a day or few, depending on how much you use.
I was in the yard yesterday beating on some rusted together parts with a sledge. They were winning. I decided (since the can was within reach) that it was worth a try. SECONDS LATER the rusted parts were yielding to the mighty blows of the sledge. Absolutely brilliant!
Also, other parts that were rusted together, that the yard quoted me TEN HOURS to get apart (and another mechanic walked away from) came apart with little resistance after two applications of the magic oil.
Now as long as it hasn't eaten my rear seal to my transmission, I'll be happy.