LibreOffice 25.2 Help
αα½α’ααααβαα·αβααααα»αααβααΆααα’αα ααααΌαβααΆαβααα ααβααΈβααααβα’ααααΒ α
CLEAN("α’ααααα")
α’ααααα αααα βααΎβα’αααααββαααβααααΌαβααβαα½α’ααααβαααβαα·αβα’αΆα βααααα»αααβααΆαβα ααβααΆααβα’ααΒ α
=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.