CV Join? Dust cover? Leakage?

Found it when having a tire change, greasy dirt are all over the wheel,
no sound, nothing special, drive like normal.



Found that was some greasy stuff while installing suspensions,
clean it and check the dust cover, everything back to normal, no leakage

But after that, all my brushes need to be replace!!! yellow brush became black and oily!
and my body as well, seems like u play with "SHIT"! I was worry about that, but not now. :)