I haven't tried it, but have heard that a solution of 1 part Molasses to 9 parts water works like Evaporust, but more slowly. I don't know what ingredient is responsible for that, possibly the glucose which is a reducing sugar. The color of the used solution might give a clue. Molasses ferments to citric acid, which is a metal chelator and would pull rust off of steel. That might explain why it's supposedly more effective when left to sit for a few days. (Probably smells bad if you keep it around too long.) Citric acid is cheap in the form of unflavored Kool-Aid. If spring ever gets here I
plan to gather up some small pieces of rusty scrap metal and experiment with some cheap alternatives to Evaporust. I like non-toxic stuff that can be rinsed down the drain without fear of the pipes exploding. Evaporust is great but too expensive to fill a large tub for soaking big stuff.
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