jazakallah for your appreciation , app ke tareef se 2 liter khoon berd gyia hai mera 
i did mention on last page Day 2 activity that i used 3m apc with dilution retio to clean enginebay
ok i elaborate further
first i cover electrial parts by plastic shopper
remove battery terminal
wash engine with open water
than with help of presure hand spray bottle containg 1 part of 3m apc and 10 parts of water (1:10 ratio )
started to work from one side, spray solution on one part than help of differnt brushes started brushing than with open water washout that area and move on to next panel .
once i completed i again give thorough wash with open water as apc is bit strong and can damage rubber pips
dry with microfiber
apply any plastic or rubber protectant like i applied meguiars ultimate protectant
for the inner side of hood, i also gave a wipe of 3m diluted soultion than washed with water, protect it with turtle ice polish