I started out with a very old Myford Super 7, pretty rusty every where, including all of the levers etc. Although I cleaned up what I could it never looked particularly smart, but after nearly three years of relatively regular use most of the control knobs and levers now look clean and shiney.
So in summary I agree with stevecmo, I find that whatever I regularly use stays "shiney", when not in use it probably has oil on it from my fingers etc so doesn't deteriorate when not in use. So like the old railway engineers wipe down the "shiney bits" with an oily rag and use regularly.
Barry