To detail an engine, you need light. You have to know what you’re going to clean before you start the process. Use a flashlight or a trouble lamp to take a good look at the engine. When using a trouble lamp, be certain there are no fuel leaks. Many a shop has burned when a hot, exposed bulb ignited leaking gas. When working around carburetors, a flashlight will provide the safest light.
This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2006/05/02/learn-how-to-clean