what parts should i cover, idk where to cover. I know some electrical stuff but i dont kno specifically. Pic of where to cover would be helpful.

 

anything with wires

remove the battery

personaly i wouldnt just spray my engine. chances are u want get any gunk off it without some hard scrubbing and lots of degreaser.

i cleaned the topend of my engine with about 10 SOS pads and lots of scrubbing. i was very impressed with the results.

soap and water goes along away