I was told by someone who seemed to know a lot about chemistry who I asked why the salt, that Vinegar,(Acetic Acid), and table salt,(Sodium Chloride), produce Hydrochloric Acid which is why it is quite aggressive. I use molasses but if you can get some EDTA Tetrasodium salt dissolves rust fast, it is a chelating agent like Evapo-Rust, museums use it among other things. Unfortunately where I live you need a license to buy it and it is expensive but it works really well.