Does the MySQL TRIM function not trim line breaks or carriage returns?

REPLACE(FIELD,'rn',' ')

CREATE FUNCTION `multiTrim`(string varchar(1023),remove varchar(63)) RETURNS varchar(1023) CHARSET utf8
BEGIN
    -- Remove trailing chars
 WHILE string<>"" and remove like concat('%',substring(string,-1),'%') do
  set string = substring(string,1,length(string)-1);
 END while;
    -- Remove leading chars
 while string<>"" and remove like concat('%',left(string,1),'%') do
  set string = substring(string,2);
 end while;
 RETURN string;
END;

select multiTrim(string,"rnt ");

select trim(BOTH 'n' from [field_name]) as field

update [table_name] set [field_name] = trim(BOTH 'n' from [field_name])

UPDATE table SET field=REPLACE(field, field, TRIM(BOTH 'rn' FROM field))

update events set eventuniqueid = substring(eventuniqueid, 1, 6) where length(eventuniqueid) = 7;