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If you use bar soap, then you definitely end up with soap residue. I admit, when I was young, I threw away such pieces of soap without looking. But now I’ve adapted to give them a second life.
And I’ll say right away, anticipating comments like: “What are you doing out of poverty?” No, not from poverty. I just don’t see the point in throwing away a product that can be put to good use.

Sponge with soap
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