Believe it or not, you can use molases to clean parts. A buddy of mine soaked rusty and greasy parts in molases diluted with water (10:1 ratio) and they came out great. The parts that he showed me was a steel turnsignal bucket with pigtail and a hood latch off a Chevelle. All the rust and corrosion was gone after soaking for about 2 weeks. He said he used industrial molases - not what you'd put on your pancakes. The connections and wires on the pigtail looked brand new too. After he pulled them out of the molases, all he did was hose them off with water and then he was going to dip the metal parts in a chemical (can't remember what) to prevent the rust from returning. One draw back is that it stinks to high hell!!! Not something you want to do IN the house!!!
Sean