LTRIM RTRIM is not working

ALTER FUNCTION FFCSSuite.[dbo].[udfTrim]
(
    @StringToClean as varchar(8000)
)
RETURNS varchar(8000)
AS
BEGIN   
    --Replace all non printing whitespace characers with Characer 32 whitespace
    --NULL
    Set @StringToClean = Replace(@StringToClean,CHAR(0),CHAR(32));
    --Horizontal Tab
    Set @StringToClean = Replace(@StringToClean,CHAR(9),CHAR(32));
    --Line Feed
    Set @StringToClean = Replace(@StringToClean,CHAR(10),CHAR(32));
    --Vertical Tab
    Set @StringToClean = Replace(@StringToClean,CHAR(11),CHAR(32));
    --Form Feed
    Set @StringToClean = Replace(@StringToClean,CHAR(12),CHAR(32));
    --Carriage Return
    Set @StringToClean = Replace(@StringToClean,CHAR(13),CHAR(32));
    --Column Break
    Set @StringToClean = Replace(@StringToClean,CHAR(14),CHAR(32));
    --Non-breaking space
    Set @StringToClean = Replace(@StringToClean,CHAR(160),CHAR(32));

    Set @StringToClean = LTRIM(RTRIM(@StringToClean));
    Return @StringToClean
END
GO