This video tutorial in Autos, Motorcycles & Planes category will show you how to wash your car's engine bay. Open the hood and check the temperature by touching with your hand and a thermometer. If it is cool enough you can proceed. Look over the engine bay to see if there is any area that needs more attention. Then spray the cleaning solution and use brushes for cleaning the areas that you can reach. Softer brush for areas that are painted and hard one for powder coated surfaces. Then use water jet to wash it off. Wash under the hood first and then the lower parts. To dry it, you can allow it to dry naturally or use a dryer. That's it!