[bammbam]

the product mentioned in the beginning and others like evaporust all have the same active cleating agent found in molasses

nice detailed post eric65 - i too tried to do my frame but I only had access to liquid molasses and the cost was going to be astronomical.

2 things I found with the molasses is that the strength of your solution and the severity of the rust will determine how long it needs to soak. Most of my parts only took a week. even soaked my engine block that was all rusty

second, the part doesn't have to soak. I used an aquarium pump and let the solution "flow" over the frame and just kept circulating the molasses.