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3 dos and don'ts for cleaning your engine compartment
The fit and finish of a car's exterior often gets all the attention, and most gearheads will debate polishes and paint protectants for hours on end. If you want to find who is really detail-oriented at a car show, don't look at the hood—look under the hood. A spotless engine bay is tough to achieve and even harder to maintain. It's worth it, though, because a clean engine compartment is not only attractive but also conducive to spotting any leaks or issues when they start, rather than leaving them to be camouflaged by grime.
I've been using a pressure cleaner with plain water for decades to clean engine compartments. It works very well, has no harmful chemicals and is efficient. The trick to using a pressure washer in the engine compartment is to know what components to stay away from and how close to a particular component one can get. The farther away, the less pressure. I don't recommend using this tool if you haven't done it before. Get a little carried away and you'll be replacing parts.