LibreOffice 25.2 Help
αα αα‘αααααα α‘ααααααααα α‘α’α αα₯αααααα ααααα¦ααα.
CLEAN(α’αα₯α‘α’α)
Text refers to the text from which to remove all non-printable characters.
=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.