Park the car out of direct sunlight. This prevents premature drying, which can leave splotches on the paint.
Set everything you will need near the car.
Fill a bucket with water and add car wash soap in the quantity directed on its bottle.
Fill another bucket with plain water.
Hose off the car to loosen the dirt. Don't use a strong jet, as this can rub grit over the paint and scratch it.
Soak a large sponge in the soapy water, being certain to wash out any dirt in it, and begin applying it to the car.
Wash the car section by section, beginning with the front and moving backwards.
When the sponge becomes dirty, rinse it in the bucket with plain water. This should be done at least once per painted panel.
After one section is washed, rinse it with the hose before moving on. You don't want the soap to dry on the paint and leave a dull haze.
As you progress, keep the entire car wet, as this will prevent droplets from drying on the paint and leaving water-spots. You want to be able to dry the car with towels before it air-dries.
Scrub the dirtiest parts of the car last (the rear, the lower body, the wheels). Use a long, skinny wheel-brush for cleaning the openings of the wheels. Use steel-wool soap-pads on the tires, one or two per wheel; they get filthy. It's also a good idea to use a separate sponge for the bottom 6" or so of the car's body, as this gets especially gritty.
Dry the vehicle with fresh towels.
If bug or tar or sap residue remain, remove it using the procedure to: [Remove Bugs, Tar, and Sap from Your Car].
After washing the car, its paint can be waxed and it's tires dressed with a product that makes them look like new.
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