Find non - ASCII characters

[Lionel Flandin]

Hi everyone,

I'm using vim to edit (La)TeX files.
Some non-ASCII characters from "wild copy/paste" give problems at the 
compilation (like the character   -> ' <- ) and it takes for ever to 
identify them.
I'm sure there is a vim command to "smoke them out" ?
Thx in advance,

Regards,

Lionel