What to do instead: Adjust the nozzle until it's basically a fine mist. It will rinse everything nice and easy. As a nice bonus, it'll give you a homemade rainbow if the sun's at the right angle.
9. Only washing what you can see
Next time you see someone washing a car, pay attention to what they actually clean. More likely than not, they're only washing the paint and windows, and neglecting the rest.
What to do instead: OK, now turn the hose up a bit -- maybe not as a full-jet blast, but not far from it, and rinse the wheel wells between the tire and the car. You don't need to scrub, but it's good to blast out any debris that might have gotten caught in there, like grass clippings and the like. Think of it like scrubbing behind your car's ears.