I use electrolysis to de rust & clean cast iron. And for a cleaning agent, I use Arm & Hammer Washing Soda. Not baking soda, Washing Soda. Its mildly caustic, and non edible. Entirely different than baking soda. As a side note, Washing Soda has many uses. If you want to really get your sheets white, add a mixture of Washing Soda, & Borax to enhance your detergent. It puts the soap back in soap.
I first discovered Washing Soda in the 1970's working in a truck garage. Cummins Diesels would blow the "O" rings out of the heat exchanger, releasing engine oil into the coolant. They say water & oil don't mix, but they do. When mixed into a pressurized coolant system, you get a heavy batter, about the consistency of pancake batter. The only way to flush this out was with a mixture of washing soda. Added to the cooling system, and allowed to run at idle for an hour or so, it would completely clean out the radiator & cooling system. However, that fix is probably dated. Washing Soda & aluminum don't get on well, so using on modern vehicles with aluminum engine parts wouldn't be advised.
As soon as the Iron Age came along, I'd guess that cast iron cooking pots were among the first items made. In Europe they were taken to Africa, replacing the traditional clay pots. They are called Potjie Pots in South Africa, & still very popular since arriving in the 1600's. Here are some links if you want recipes. or are shopping for cookware. Wether it's a Potjie Pot. or an American Dutch oven. it's all cast iron cooking. Americans are just a little late to the game on the cast iron timeline.
Welcome to Potjiekos World - Potjiekosworld potjie recipes
https://potjiepotusa.com/
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