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Re: How can you safely clean the engine compartment?
Generally cleaning under the hood is not necessary. Lots of cars that are otherwise spotless are a bit dirty under there.
Do NOT use a high prerssure water cleaning wand. Some people do and they are either washing older cars with fewer electronics or know exactly what to clean and what seneitive electronic components to stay away from.
IMO use a spray can of engine de-greaser, fir grease build up areas only. For the rest of the engine compartment, use soapy water and several soft brushes of various sizes, a tooth brush is great for the nooks and crannies.
Then just gently scrup away. Be careful around electronic components and aviod getting water around the electrical connectors, fuse box, etc.
Dry things with soft cotton rags (old T-shirts are great.)
As for rust, you can stop it by spraying the metal lines with some WD40. If you want to make it beautiful again, polish them with some fine grit emery cloth (180-220 grit) cut into long, thin (1 inch wide ) strips. Then paint the lines with a little spray can of clear laquer to preserve the 'polished metal' appearance.
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