I have a 55 gallon drum that I fill every year for my old parts. Use the hell out of it and dump it in the late fall.
I buy a 50# bag of dry molasses for about $18.00 at my local feed store... makes about two barrels of mixture. Mix the hell out of it and go to town. It usually takes at least a week to derust any sizeable rust deposits... be patient and you will be amazed.
