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Plastic rocker, you'll always get some build up. Unless you've got a milky residue on your dipstick I wouldn't worry.
I'd be checking for coolant leaks elsewhere, its not uncommon for pipes clips to be leaking, or water pump seals.
The rears are pretty long, unsure on the exact length. To be honest if you're going to be removing them i'd start getting some penetrant on them now. Especially on the rears as if they snap in the beam they're a pig!
They'll usually come out fine tbh, they're pretty big bolts. If you're worried, just buy some camber bolts then swap the top bolts to the bottom and shove in camber bolts