Well, my MBP cable has gone yellow after a while. I've tried cleaning it with water, and also toothpaste (with whitening) and that doesn't seem to have removed the yellow stains. I guess I'll try mouthwash next; I may have to gargle that myself first. Anyone have the same problem? I haven't been keeping it in unusual places, in my bag and on the desk.
On the left is the whiter clean cable.