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Originally Posted by Maximo  Thank you for the explanation.
During WWII when everyday items were rationed, my grandmother made her own laundry soap with saved cooking grease. I googled and it seems to be a common practice among enviros to use leftover cooking grease for everything from powering cars to making soaps/toiletries. |
That is when soap was starting to be made of petroleum by products, some may still be made of it.