Any suggestion how to clean engine bay ? Which parts should avoid get wet?

 

You'll receive and read a lot of opinions on this, but in my experience you don't have to really do anything special per se, but just use some common sense. After all, an engine bay is designed to get wet naturally.

That being said, unless you really know what you are doing, high pressure or power washing is usually a bad idea as you can force moisture into places that it may then linger or perhaps not even dry out easily at all. You should also avoid spraying electrical connections and components directly with strong streams of water. And using harsh chemicals like grease removers can damage painted and raw aluminum surfaces.

So my advice is using mild detergents or purpose made engine cleaners, and if necessary spot clean with a soft brush or cloth, then light spray to rinse.

It is normally not recommended to wash the engine while hot, but after you have washed and fully rinsed the engine, I like to let it air/drip dry for a bit then start the car and let the engine get to operating temperature so the engine heat will dry it the rest of the way.

I've washed myriad old and modern cars and motorcycles using this method and have never had a problem such as electrical snafus.

But again, a quick search in the exterior care subforum or just Googling will turn up lots of advice.

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I am with Al.

Pressure washers and Jaguars are not a match made in heaven.

I use a p/pack degreaser on the bay itself, and then a simple pump up pressure thingy (like the green thumbs use on their plants) and wash away that degreaser. Be carefull around electrical units etc, but as said COMMON SENSE prevails.

The engine, VERY carefully, and QUIETLY. Cold, or at most a warm engine. Warm greasy stuff shifts easier than cold I am told. Do the top with a soaked rag, coz water etc down the plug holes is a bugga.