Found a good article on mouthwash from Time.com. It brings up a great question...does mouthwash make your breath better or worse?
I know this sounds ridiculous, but Listerine, the most popular mouthwash, contains 26.9% alcohol. And, while alcohol facilitates dissolving some of the flavor oils, it also dries out the mouth. Saliva helps "wash away" bacteria, thus a dry mouth is a fertile area for bacteria.
So, what to do? I've written about flossing before (http://cocanuts.blogspot.com/2008/01/floss.html and http://cocanuts.blogspot.com/2008/01/more-floss.html) , but I will iteriate. Remember to floss to get the food that gets trapped between your teeth, use an electric toothbrush, and scrape or brush your tongue. And, although I haven't really tried them, you can try one of the non-alcohol containing mouthwashes. Post a comment if you have tried one of them.