What does a used car sales person use?

Hey all, I am gonna be selling my Ford probe, and the components under the hood ie. the engine, heheh, are very dirty and greasy. I was just wondering, what do the used car sales people use to clean it when they pressure wash it. Like what kind of de-greaser do they use, and how do they do it, like will my car start after I drench the engine with water, like what should I cover.

Any info is appreciated. THANKS!

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