Learn Spanish (Latin America): Uno se limpia el sudor con la camisa sucia. - One wipes the sweat off with the dirty shirt.

When a verb is already reflexive (like limpiarse), you can't use the impersonal se because you would end up with a confusing double se or an ambiguous sentence. Using uno is the standard way to make a general, impersonal statement when the verb requires its own reflexive pronoun.

If a woman is speaking, would she say Una se limpia el sudor?

Yes. Unlike the English word "one", the Spanish impersonal pronoun has gender. A female speaker will often say una when making a general statement, showing that she includes herself in that generalized group.

Why is it se limpia el sudor rather than limpia su sudor?

In Spanish, when talking about actions performed on your own body, clothing, or things your body produces (like sweat), you use a reflexive pronoun (se here) plus the definite article (el), instead of a possessive adjective (su). The se already shows that the sweat belongs to the person wiping it.

Does limpiar mean "to wipe" as well as "to clean"?

Yes. While beginners learn limpiar as "to clean", it is also the standard verb for "to wipe" or "to wipe off"—whether that is wiping sweat from your forehead, wiping tears from your eyes, or wiping down a dirty table.