Today I gave the engine bay a shot! Used nothing fancy just hands and a tooth brush and some shampoo. And here it is.
Still not dressed at the time of pictures because was slightly wet. I usually apply sun of a gun and turtle ice synthetic Liquid polish to the plastic and rubber parts. Works good for me. 
The thing is, though its too clean for a service wala or any normal human being but not to a detailer. When I peek inside sometimes, I notice a whitish spot. 
I can't reach it with any brush.
Is there something very strong that can be simply sprayed on to the dirty parts and makes the dirt flow away?
P.S Sorry for the noisy and improperly focused pictures; Maghrib ho chali thee car finish kartay kartay.
