After using the car 4-7 times (short trips), I use a piece of cloth (preferably an old towel), diswashing soap, and water. And I use a dab of WD40 to get rid of stubborn dirt/grime if necessary.
Funny thing is, I tend to clean the wheels more often than the exterior/interior, because they get dirtier than the car after a few trips.
Maybe it's time for some EBC's...