Oxalic acid is about the only stuff that removes FeCl3 stains from clothes etc. I bought some a long time ago, but have never needed it until my latest PCB making exploit, when I got a couple of small splashes on a pair of cotton trousers. I added a teaspoonful to a little water, and stirred it until it dissolved. I soaked the stains in the solution and left them for about 30 minutes. Most of the stains had gone, and I washed the trousers with some other things. The stains are barely visible now, and will probably disappear completely with another treatment. Oxalic acid is sold on Ebay, for whitening wood on boat decking. It's rather toxic, so don't drink the solution. Leon -- Leon Heller G1HSM
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Removing FeCl3 stains
2012-02-15 by Leon Heller