just make sure your battery, alternator, and fuse box is covered and spray it down really good with water. then get some good engine degreaser ( i like cd-2) and spray it on and run your motor for about 15 mins and let it dry and bake on and you will look as good as new.
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1994 Mustang GT, just a few minor appearance mods, engine mostly stock (for now)
I use Simple Green. Spray the engine when it's warm, let it sit, cover the alternator, battery, air intake, computer box with towels then wash it with a garden hose spray nozzle. The I wipe it down and wipe the hoses with some Meguiar's Hyper Dressing.