After blocking off/bagging anything I don't want to get wet, I just spray the entire bay with water (regular hose -- I never use a pressure washer in there). Then I spray the APC where I need it. I have a dedicated crappy microfiber towel and a small brush just for the greasy engine bay stuff. I usually let the cleaner sit for a few minutes, but honestly agitation is going to do more for you than letting it sit anyway. I concentrate on the dirty areas but give the entire bay a once over. Hose off with water, double check your work, and start drying things off. After it's mostly dry I get the towel with the 303 and put on the finishing touches.
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