in a nutshell:
warm car up, hose out lighting, spray some castrol superclean (or simplegreen or whatever you like/have) scrub and tough spots like the strut towers and top edges of the fenders with a little brush (i use one meant for the kitchen sink)
i personally finish it off with some tire shine foam, but beware that this stuff can get sticky later and attract dust and dirt, but i try to stay on top of it and hose out the bay every couple times i wash the car, keeps the guck to a minimum.
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