You can find it at Wal-mart or Ace hardware for sure in powder form. I use DAP Wood Bleach (Oxalic Acid). Been using it since Quik Glo went out of business and had to find a replacement product. Less hrs spent tying to get that chrome back into shape since using Wood Bleach. You will have to buff and polish the items after use as it leaves behind a yellow residue. Even after the water back. I will have to try the baking soda idea. I have soaked entire rusted frames in the mixture. I was informed of this product by a collector\restorer on VintageBMX.

Good stuff.

Co Manager of Schwinn Collectors

Here is link if you are interested:
http://www.vintagebmx.com/community/...hl=oxalic+acid