Cleaning Engine Compartment

[mickeystoysz16]

I am looking to clean the engine compartment of my 2004 Silverado. I am not looking for a full detail but want to clean all the oil, grease, and layers of dust and dirt. The last time I did something like this my truck had a distributor. I used to cover the distributor and any electrical components with plastic and duct tape. The truck I have now is a 5.3L Vortec my first with FI and coil packs.

My question is are all of these newer type of electrical components and connections water and weather sealed? or do I need to cover all the coil packs and electrical connections before I use a spray hose under the hood?

I love the P21 cleaner products that I used to clean my motorcycle v-twin but then it was a spray on and hose off application. I would like someone opinions before I do this with my truck. I am going to use my truck as a test monkey before I do any detailing on the vette.