Anyone ever tried electrolysis and oxalic acid? Many years ago I worked in a museum restoring antique equipment and when we had stuck parts we would mix up some chemicals and connect the parts backwards from normal plating causing rust partials to be drawn off the stuck parts to a peace of old copper pipe. Normal plating battery connections have the parts to be plated connected to the negative post of the battery and the plating material connected to the positive post of the battery. We used an old 6-volt car battery that was supplying about 3 volts and we connected the positive battery post to the stuck part like a piston and the negative post to the old copper pipe. I just wonder if using about 3 volts DC in addition to oxalic acid would speed the process, as the rust would be drawn away from the part as the oxalic acid works on it.