1) copy that char and paste it into a text field ( name it strangeChar )
2) make a calculation field ( result text ) with calc: Code ( strangeChar )
3) you'll get a result like 11 ( for example)
4) so now your calc for substitute will become: Substitute ( text; Char ( 11 ) ; "" )
Thanks for the quick reply. That worked perfectly. It was Char(10).