Charlie's Soap was originally formulated in the 1970s, to clean lubricant (and the dirt stuck to it) from machines in textile mills. Back then, nitrile gloves weren't a thing; the workers doing the cleaning were using bare hands. The factory setting put the product to the test: it had to clean grease and accumulated crud, not harm the skin of the workers, and not be a problem with the wastewater treatment plant.
Charlie's father (also Charlie) made his living supplying the oils that lubed the machines. Charlie Jr has a background in engineering and chemistry, so he was able to reverse engineer a formula to break down the oils in water. Just like what we need to happen when we wash filthy clothes.
Charlie's is a complete detergent, you don't need anything else to clean your clothes.
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