nope. washing and rinsing is sanitizing. Ive even experimented with bottles that were in my garage for months, covered with dust. The 3 main things im concerned with is cleaning, rinsing and drying. Cleaning and rinsing will wash most microbes away, and drying will prevent new ones from hanging around. I think the source of most beer infections happen early on (pre-yeast pitching) and come from ones own body.
we did an experiment in microbiology class where we took petri dishes with a malt based food on them, and swabbed various parts of the room, then tried innoculating the dishes. There was about 30 people who did this and swabbed everything from the floor of the bathroom to the insides of window shades, the back of hands, and i even pressed my tongue in the dish for 2 minutes. The results after 3 days both in incubaters and at room temps: hardly any growth at all. The most growth came from the one from my tongue, and even that one was not very impressive. It was funny that the experiment was to show how omnipresent microbes are, it just proved the opposite. They are not as ubiquituos as you might think. Sure they are everywhere, but in really small numbers.