Don't clean it...you're going riding again tomorrow right?

Seriously, all I do is wait for stuff to dry a bit and then brush it off. I use a different brush for the drivetrain. Once that's clean I apply a generous amount of chain lube, shift through all the gears, then hold a rag to the chain and pedal to remove the excess chain lube. If I really want to get the bike clean I'll bucket wash it but I don't recommend spraying it with a hose.