For information, the active ingredient / chemical compound in both molasses and in Coke that "removes" the rust is Phosphoric acid.
Phosphoric acid is used in most "rust converter". The phosphoric acid converts the reddish-brown iron oxide (rust) to black ferric phosphate.
You can buy Phosphoric acid, I have had a 20 litre drum of the stuff since the early 90's and have been using the same acid, now somewhat diluted with water, for cleaning out my fuel tanks. On a lightly rusted tank it only takes a couple of hours, and the longest that I have had to leave the acid in a tank is about 24 hours.
CJ
Molasse
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