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Don't use a strong jet of water from the hose, as this can rub grit over the paint and scratch it. Try to aim the jet of water downwards on all surfaces. Aiming upwards around windows may cause water to dribble into the car if there are flaws in the rubber seals. Since the wheels of your car are often the dirtiest part, it's a good idea to wash them first, so that dirt rinsed off of the wheels won't land on an already-clean part of your car. Use a long, skinny wheel-brush for cleaning the openings of the wheels. If the wheels are already glossy and clean, instead use a sponge or a mitt to clean them just as you would the car body after hosing off as much of the extra dirt. Before you begin scrubbing the surface of your car, soak a large wash mitt or sponge in the soapy water, being certain to wash out any dirt in it, and begin applying it to the car. Do not use a brush on the car body, because this may leave little scratches. Mitts with long, dangling strands do not push grit onto the car as hard. This type of mitt is preferable, as it's less likely to scratch the surface. They should still be rinsed, then dipped into the soapy water often. Mitts, unlike sponges, can also be washed in washing machines to remove all the grit. Circle around the car several times, washing lower areas with each round. Washing the car from the top down will allow soap to drip over lower sections of the car while you're still washing higher sections. This will prevent you from having to wash the same sections twice. If the car is very dirty, let the soap and water do the work. Make multiple passes and avoid excessive scrubbing at dirt on the car, as this could scratch or damage the paint. Bird droppings and bugs can damage the paint, and extra care should be taken to remove them while washing the car. Get them off as soon as possible using a damp rag if you need more scrubbing power than the wash mitts can provide. Soften bugs by dabbing with a sponge that is loaded with warm water, then let the water soak in and scrub the bug off. Use "bug and tar remover" where needed, as this will effectively and safely remove dried bugs from the surface of your car. Do not scrape hard or use a brush to remove the bugs, as that will mar the finish. Ultimately, a few stubborn bits of dirt will look better than scrapes. Rinse the dirt out of the wash mitt or sponge in the bucket with plain water frequently. If you allow dirt, grime, and grit to build up in the wash mitt, you'll risk scraping or damaging the car's paint. Rinse the mitt regularly in the rinsing bucket and, when the water in the bucket has become opaque or gritty, throw it out and re-fill with clean water. 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 stain it. When rinsing sections, follow the same top-to-bottom pattern that you've used to wash the sections of your car. Always wash the door shuts, surrounds (the metal visible inside of the door well), and the bottom underside of the doors. It's an unpleasant surprise to open an otherwise sparkling clean car to find dirty door shuts. As you progress from one section to the next, it's important that you use the hose to keep the entire car wet. This will prevent water 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 lower body and the wheels last, as these are the dirtiest, grittiest parts. It's a good idea to use a separate wash mitt or sponge on the bottom, as you'll likely end up with a completely soiled wash mitt from this part of the car alone. If your tires are gritty or have absorbed dirt and grime from the roads you've driven on, you may not be able to successfully clean them using only a sponge or wash mitt. Use a plastic brush with stiff bristles to clean the dirt from your tire sidewalls. Your local auto parts store will sell various brands of Tire and Wheel Cleaner, which will help you effectively scrub off dirt from the rubber tires. If you choose to, you can use vinyl/rubber/plastic conditioner for dark-colored plastic parts and for tires. This should be available for purchase at your local auto parts store. At some point after you've washed the majority of your car's surfaces, use the spray from your hose to rinse the bottom of the car, from various angles. This is particularly important when the car has been exposed to salt, which can damage and corrode the underside of your vehicle.

Summary:
Hose off the car to loosen and soften the dirt. Wash the wheels first. Wash your car using a large wash mitt. Wash the car section by section, starting at the top. Scrub off bird droppings or splattered bugs. Keep the wash mitt clean. Rinse each section after you've washed it. Keep the entire car wet as you wash it. Save the lower body of the car for last. Clean the tire sidewalls with a plastic brush. Spray the hose over the bottom of your car.