Just so nobody misunderstands, I am not a “dip & forget” mechanic. I have tried all of the rust removal methods including muriatic acid, phosphoric acid, electrolysis, Evaporust and molasses. They are all good but I found that the molasses is as good as the other methods with no side effects except length of time in the bath and it is cheaper. It is easily available at any store that sells livestock products or in your local grocery store. The store has smaller quantities than the agricultural sources but you can get larger jugs and lower cost per unit from the ag suppliers. Molasses is the same whever you get it.
I think Evaporust is basically oxalic acid, citric acid also works and it comes from lemons, rhubarb and other fruits.
Here are some good links to more good info:
https://hubpages.com/technology/Rust...l-by-chelation
https://www.youtube.com/watch?v=6Ir1p4Eejl4
https://www.youtube.com/watch?v=6B9sRHOxhoc
Then there is also LASER rust removal. IF you have $50,000 to spend!
This method is AMAZING !!!!!!
https://www.roadandtrack.com/car-cul...remover-laser/