It could be marketed as white laundry soap, but it would gradually make your white laundry browner and browner without you immediately noticing.
We could use it to scrub floors. You could walk on it every day.
Not sure if that's a good idea. It would probably seep beneath the floorboards.
I don't think so. Once you've converted the fats into soap, the former owner generally has no control over it.
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