Learning how to wash a car can be an easy and fun activity, especially on a hot day. Park out of direct sunlight and assemble the items you'll need: soap, two buckets, a good quality wash mitt (or two or three), a working hose, wheel cleaner, and some microfiber drying towels. Always use a proper soap designed for washing cars and not a dish soap which can strip wax from the paint surface. Add some of this soap to one of the buckets and fill them both with warm water. The second bucket will be used to rinse the sponge, keeping most of the dirt out of the soapy water.
If there are any bug marks, sap, or bird droppings on your paint you can treat them with a little bit of straight car wash soap to help make them easier to remove. Rinse the wheels and tires, and spray on some wheel and tire cleaner (but first make sure that it's safe for your wheels). Using an old wash mitt clean the wheels and tires, and then rinse them down. If you used the rinse bucket while cleaning your wheels, empty and refill it with fresh warm water.