You don't! Unless you have flies and cockroaches infested kitchen, some stray bacteria left after just water-washing will be much less harmful than eating the stuck-on-surface dishsoap (which does not rinse off completely, since it's hydrophobic). I have an even worse opinion of people constantly bleaching their countertops. shudder

As an anecdote, I once had a misfortune of living with a guy who would never rinse off the dishsoap from the dishes at all, just leave them out to dry still covered in suds!