My cv boot cracked and now I have grease on the inside of my rim, Is there anything quick and easy to clean with that wont mess-up the rims finish. The rim is the Z track rim

 

Same happened to me on my G35 wheels. Get the axle replaced if you havent already. First, I took the wheel off and wiped off with a wet rag some of the areas where its really thick and on there good. Then I took an old wheel/tire brush (old b/c it will ruin a new one), some dawn grease fighter dish soap, and the hose on highest pressure, kinda took it off in coats with some elbow grease.

 

wipe the worst of it off with a paper towel...
then you can use WD-40 to cut the grease and it'll wipe right off.
then clean with dish soap to remove residue.
re-wax if you wax your wheels.

Engine degreaser also works okay on painted surfaces, but don't let it dry on the spokes. that could get ugly.