Php send junk

[nc3b]

I try to send a file from the server to the client, using
[code]header("Content-type: text/x-csv");
header("Content-Disposition: attachment; filename=blabla);
header("Pragma: no-cache");
header("Expires: 0");[/code]
It is a csv file. The problem is, it inserts three "junk" :-[ characters, EE EF BF as the first characters, which look like   :(. I understand this is "Byte ordering mark". Very well. How do I get it to vanish? ??? Please help