Dude, you don't really want to try to do "scorched-earth" annihilation of all mouth bacteria-- or bacteria anywhere else for that matter. First, it won't work, you'll never get rid of all bacteria. Second, that's like taking the surviving bacteria "to the gym", clearing out the normal flora of bacteria, and replacing it with whatever nasties can survive your treatments.

Flossing and brushing (and some tongue scraping) is all that is necessary. Alcohol based mouthwash dehydrates the mouth a bit-- which might precipitate bad breath.