Here's a newer video (actually there's more than one) on using molasses to remove rust from large panels.
Kinda fascinating, really. Whoo'd a thunk it???
http://youtu.be/KZCFcxf5IBw
BTW- Blackstrap molasses is sweet/bitter, for feed and flavoring.
Sorghum molasses is fer putting on yer biscuits n cornbread. Just ask any Southerner. Better'n honey. Good in yer grits, too.