The American Cleaning Institute (ACI)

Ask ACI: Longer Lasting Bar of Soap

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Q: Will a bar of soap last longer if you let it air out or if you keep it closed up in a soap dish with a lid?

A: It's preferable to let it air out. If you keep your bar soap in a closed container, the soap will stay wet. As a result, it can become mushy and dissolve quicker.