But even in Qatar,just like I did back in SL, whenever I do eat at a food court(which is very rare) I do clean up after myself. Leaving the tray behind for the next person to clean off, in case the cleaning guy doesn't reach there fast enough, just isn't my style. And yes I find it to be of good manners and consideration to do so. And I believe we actually had a discussion on this topic sometime back in QL!