Hey Dave,
As for the Hellerman sleeves, they're a piece of cake to remove afterwards. Just get yourself a tiny pair of medical scissors, and very carefully cut the sleeve right off. It's soft rubber, so it cuts easily, just be careful to watch where the tips of the scissors blade that you put inside the tube goes, so you don't nick the cable itself (hence why I suggest the tiny medical scissors).
As for the markers, I'm not sure offhand, since I never had to clean them off. I imagine something will clean them, although I don't know for sure what, and can't guarantee that the same solvent wouldn't be a very bad thing for the cable. I do know that rubbing alcohol doesn't do much for cleaning them, though.
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