first thing's first, cover up things you don't want getting wet (distributor, air filter, other exposed electronics) with either plastic wrap from your kitchen, or plastic shopping bags. you want to clean the motor when the car is cold (first thing in the morning if possible) because spraying water on a hot motor can cause issues due to sudden temp. differences
I've always used the foaming engine cleaner you can get at autozone. spray the whole fucking bay. everything. everywhere you can reach. usually 1 can isn't enough for getting it done REALLY thorough. let it sit while you use a stiff brush to get into nooks and crevices, or places that are overly dirty.
after you've scrubbed everything down, start the car, and spray down the engine bay with a hose for a few minutes until all the cleaner is gone. let the car run for about 15 minutes, helping evaporate and dry the water. if you missed a spot, re-clean it. should be easy to see now that the rest of the bay will be cleaner.
I usually blow out the whole bay with an air compressor to get water out of everywhere (like under spark plug covers and such), while the car is running. once it's all done and dry, i drive the car around the block a few times to get it nice and hot and the rest of the water evaporated that you missed when drying it. come back, grab a rag, and dry down anything that's still there.
after that, go to town with tire shine (radiator hoses, intake couplers, etc.) that shit really makes everything shiny. i usually do most of the bay with tire shine, then follow up with a rag and wipe everything off. then clean your polished parts either with aluminum polish, or glass cleaner on a clean rag.
use brake cleaner on a rag to clean the grease off stuff like plug wires and any colored vacuum lines.
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