Oil of wintergreen makes a great rust remover too, and just plain smells great.
That delicious medicinal aroma plus the brain cell depleting solvent huff buzz and you're there, buddy!

Now I'm wondering what happens to the solids content when the solvent evaporates? I have a pair of 414s that had a major goop accumulation at one side of the surround when I boxed them up and put them away and 7 years later, the goop is GONE. if I put acetone on these, will the goop magically reappear?