Coincidentally, this weekend I needed to strip the heavy and not-realistic-looking chrome off the styrene trees for a Tamiya 1:12 Lotus 49 Formula 1 car. Soaking overnight in bleach did absolutely nothing on these, for some reason. Next, I poured a little Liquid Plumr (their spelling, by the way) into a plastic bin, dropped the trees in, and the chrome was off in less than 10 minutes.