Res: converter pgplsql funcion

not working.. i try to explain my dought
my idea is:
1- create a table for storage special caracters,
create table caracteres(
caracter character varying
);
insert into caracteres values(':');
insert into caracteres values(';');
insert into caracteres values('<');
insert into caracteres values('=');
insert into caracteres values('>');
insert into caracteres values('?');
insert into caracteres values('[');

after
2- create a funcion:
create or replace function clean_string(_p_dado character varying)
returns character varying as $$
declare
  _v_clean_string character varying := _p_dado;
  _c character varying;
begin
  for _c in select caracter from caracters loop
    _v_clean_string := btrim(_c_clean_string, _c);
  end loop;
  return _c;
end;
$$ language plpgsql immutable strict;
 
for make a command
update TABLE set COLUMN = clear_string(COLUMN);
------------------------------------------------------------
atually a had follow error:
create table caracteres(
caracter character varying
);


Consulta executada com sucesso sem resultados em 78 ms.

-- Executando consulta:
insert into caracteres values('"');


Consulta executada com sucesso: 1 registros afetados, com tempo de execução de 0 ms.

-- Executando consulta:
create or replace function clean_string(_p_dado character varying)
returns character varying as $$
declare
  _v_clean_string character varying := _p_dado;
  _c character varying;
begin
  for _c in select caracter from caracters loop
    _v_clean_string := btrim(_c_clean_string, _c);
  end loop;
  return _c;
end;
$$ language plpgsql immutable strict;



Consulta executada com sucesso sem resultados em 16 ms.

-- Executando consulta:
update cadastro.cliente set clie_nmcliente = clear_string(clie_nmcliente);


ERROR:  function clear_string(character varying) does not exist
LINE 1: update cadastro.cliente set clie_nmcliente = clear_string(cl...
                                                     ^
HINT:  No function matches the given name and argument types. You may need to add explicit type casts.

********** Erro **********

ERROR: function clear_string(character varying) does not exist
SQL state: 42883
Dica: No function matches the given name and argument types. You may need to add explicit type casts.
Caracter: 46

any idea for help ou give another way to complete this ?