LibreOffice 25.2 Help
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CLEAN("Text")
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=LEN(CLEAN(CHAR(7) & "LibreOffice Calc" & CHAR(8))) returns 16, showing that the CLEAN function removes the non-printable Unicode U+0007 ("BEL") and U+0008 ("BS") characters at the beginning and end of the string argument. CLEAN does not remove spaces.