Before you begin cleaning, it's important to learn where all the key engine components are located; including ignition coils, ABS computers, main computers, and the fuse distribution panel. As a professional detailer, check with the vehicle manufacturer or car dealer regarding potential trouble spots.
The engine should be off and cool. You risk cracking metal components if you start work when the engine is too hot. Remove any loose debris such as leaves and pine needles. Also do a visual inspection for any loose or cracked wiring Cover any sensitive electronics with towels or plastic.
Case of 4 Gallons.
Kleen-Shine | Power Buster Degreaser