User talk pages are not normally deleted - see WP:DELTALK. With limited exceptions, explained at WP:BLANKING, you may blank anything you like from your user talk page, but the history is retained for the record. If you want more than that, and are leaving Wikipedia permanently, see Wikipedia:Courtesy vanishing for what to do. Regards, JohnCD (talk) 17:41, 4 November 2012 (UTC)