remove junk characters

From: kums (bckumari_at_yahoo.com)
Date: 01/29/05 

Date: Sat, 29 Jan 2005 01:59:30 -0500

hi,
 I have extracted contents from tamil webpage and stored into one file.
 While doing some process on this file,some extra
junk characters are stored inbetween the tamil text.
 how to remove these junk characters?