An alternative method would be to obtain some Glycerol, which is the byproduct of the bio fuel production. There are a lot of small operations that need to get rid of the Glycerol.... For free......
It removes grease and other caked on grunge in no time. It's also bio degradable and can be washed off with plain water.
Once the part is clean, you can apply OsPho which is a physophoric acid to get rid of the rust.
Mike
