There used to be a couple of postings on how to remove the rear wiper for repainting, but I couldn't find them when I did a brief search. However, to be truthful, given the potential for damaging the wiper arm and the shaft, and the fact that pretty much anything you use to repaint the arm is going to come off again anyway, I've always used this method: get a large-tipped permanent black magic marker and just color the thing in. After a day or two nobody will notice that it's not painted and the bare metal will be colored. When it wears off (which takes quite a while, considering) just touch it up.