Detailing the Commodore VZ Engine Bay

Hi there,

As you can see in the pictures my rides engine bay has become the dirtiest of it as it can :\
Am planing to detail my engine bay, but before doing that I had a few worries that I need to take care of and some suggestions\help.


In the very first picture I've circled in the red and numbered a few parts am worried about to cover or not to cover (am gonna cover em with plastic bags).


1. Fuse Box,
Am thinking of covering the fuse box at first before spalshing water all over the engine and then doing all the corners near the fuse box at the very end of the detailing using a detailing brush.


2. ABS,
I don't think I should cover this but its better to ask then crying later :P
So what do you guys think about covering it?


3. "THE VZ HOLE",
From the day I bought this car, I've no idea why they've left that space :P ...At first I thot there was a bolt missing so I asked the mechanic, he said it comes like this by default :P ...anyhow... should I be worried about the "THE VZ HOLE" ? :P


4. Air Filter,
Last but not the least, am thinking of removing the whole air filter+assymbley, as obviosly there 'll be dirt & grime below it for sure, so covering the sensor and the manifold inlet and then cleaning\detailing the engine


I'll be using, Aqua2Go (Portable Pressure Washer), other then that plz let me know if there is any other part that I need to cover or I things I need to keep in mind.



Thnx in advance