So every 6 months or so i will give the engine bay a clean with some gentle all purpose cleaner and a high pressure Karcher. Just dont point the water directly at any electrical components. Then I use compressed air to blow water out of all electrical connections etc (although they are generally waterproof anyway).
Then every month or so I just wipe over with an old chamois that i only use for inside the door jambs and engine bay just to keep the dust under control.
I have used this method for many years on many different cars and never had an issue.
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