I did some professional detailing for about 4 years during HS and college....
i would only recomend this if you know what your doing...otherwise just buy the store stuff and scrub off for hours....anyways make sure the engine has cooled for at least 2 hours so you dont crack the block...use either one 1. some type of industrial grease remover or 2. which you will probably only have if you are a serious detailer, wheel cleaner (the real type, not store alkaline soultion, the acid) and spray througly on all METAL surfaces, be careful of rubber hoses ect, and then after coated let dry for about 5 minutes...then turn on the car and all the dried grease will fall right off in clumps do to vibrations....then follow up with chrome polish, and then an antitsick teflon agent to prevent buildup and keep looking awesome longer......
if you have any more questions dont hesitate to ask or PM me...