Today I decided to wash the inside of my rims while I was in the process of rotating them. I went through three rims perfectly fine until I got to the one that had the CV boot tear (replaced the axle since then).
My usual method of car wash soap + sponge did not fair so well. So what I did is this... grabbed the big spray can of engine degreaser I had laying around, sprayed a crap load of the stuff on a dish washing sponge (the rough side) and went at it! I made to sure to use plenty of water to wash off the now dissolved grease.
Needless to say, the rim looks BRAND NEW inside... the degreaser said do not use on wheels, but hey, I only used it on the inside anyway
Also waxed my rims... I just used Zymol and they are nice and smooooth.
PS: I also think that Dawn or WD40/PB Plaster would've worked. Anything that can dissolve grease.



















