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Me, I just wash down the plastic parts (intake cover, airbox, fusebox, etc.) with water and car shampoo to move the dirt and dust away. Fortunately for us, the way the GDs' L-series engines are designed means it's pretty difficult for water to get in via the ignition coils. They're tucked underneath the intake manifold. That said, don't overdo the water.
Once the shampoo has done its job, I wash it away. I let it dry, then I slather on some Armor All protectant and wipe it on the aforementioned plastic parts - just to keep 'em shiny. Unless you're a professional engine detailer, it's better to stay on the safe side with cleaning the engine bay. The way I see it, you can probably get away with just cleaning the plastic pieces because they're the most obvious.
HTHs
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