It's really dirty and it has sand in the crevises.
i have always wanted to try that aa method but no one ever states which kind of armol all to use. I wouldnt want to use tire shine on my engine if something else is required.i can remember 1 time bagging my fuse box ect.
since then, i have never done it and never had any problems.
Get some greased lighting or some sort of degreaser as previously stated from a autoparts store. Wet the motor down, cake it in degreaser (watch your fenders and other painted areas as it will take whatever wax you have on it and maybe even your clear coat right off) and let it sit for 5-10 minutes.
Hose it off and then the secret, which no one has stated....
Douse the entire engine bay in Armor All. No BS. once everything is covered in AA, let it dry and admire.
Few side notes...it doesn't have to be dry when applying the Armor All.
It may look like shit while its drying but once its done its giong to look great. Trust me, i wouldn't do anything to my cars that would hurt them and ive been doing this for years. ZERO problems.