I've bought a few on Craigslist and cleaned them up. Just get a wire brush and get the rust off as best you can. The sleeves come off by removing the snap ring (just keep everything together in the same order if you do this, it'll be easier to put back together). Use some 3 in 1 oil and clean it. I use WD40 on the outsides of my bars and sleeves. Spray on, brush w wire brush, wipe off, repeat if necessary. I made the mistake of painting one of the first bars I had. The paint looked good at first but after sliding plates on and off a few times looked like shit, not to mention the mess it makes w paint chips everywhere. Besides a rusty bar looks better, adds a little character. Keep an oil cloth nearby and give it a wipe once or twice a week and you shouldn't have to do another deep cleaning again.