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I'm teaching my little children to wash their hands.

Why do people say "clean in between your fingers"?

Why not "clean between your fingers"?

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There is no difference. In is sometimes added just for emphasis, just as we might say "The ornament is up on top of the bookshelf", where the only function of up is to draw attention to the high position of the ornament.

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Careful English avoids this. For example:

Where are you at?

To answer your question, the correct thing to say is "clean between your fingers."

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