Removes rust; methods include using fabric dipped in Coke, a sponge or even aluminum foil. It also loosens rusty bolts.
According to eHow, the same carbonated cola drink that refreshes you can be put to work to remove rust. Phosphoric acid in most soft drinks interacts with iron oxide to dissolve rust. Phosphoric acid is also found in commercial cleaners.
While using cola for rust removal is a green cleaning solution, its relatively low level of phosphoric acid means it works more slowly than commercial rust removers.