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I use a pressure washer, but I don’t place the high pressure nozzle directly on any specific component. I rather hold it back a little so I’m getting mostly a lighter spray effect. Hard-to-remove stuff I’ll hit it with high pressure making sure I’m not compromising sensitive components. The cleaning products mentioned above help.
My oddball approach is spray/soak the engine bay 2/year generously with W40 and let sit for a refreshment or two. I then use a mild degreaser to soak the engine for another refreshment and pressure wash (cold!) engine with medium hot water pressure. Works for me since years and my engine bays look slicker than a monkeys' east end running west
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