To wash a black automobile, you will need a water container, car wash soap, a wash mitt, and a microfiber towel. Rinse the car to get rid of any loose dirt, wash it in sections with the wash mitt and soap, re-rinse, then dry it with the microfiber towel. Parking the car in the shade will help prevent water stains, and you should avoid using rough brushes or sponges that could harm the surface.