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<p>[QUOTE=&quot;-jeffB, post: 3839385, member: 27832&quot;]Okay, I&#039;ll blabber, because I&#039;m not privy to any trade secrets, and I haven&#039;t tried any of these. I&#039;m just basing it on fairly basic chemistry.</p><p><br /></p><p><b>Complexing agents</b> like the gallon-jug stuff mentioned above chemically combine with rust but don&#039;t affect metal at all. They may not be very aggressive, though.</p><p><br /></p><p><b>Acids</b> can turn rust into soluble compounds, but can also attack metals. Some acids may be weak enough to spare metal, but still strong enough (or having other special properties) to get rid of the rust.</p><p><br /></p><p><b>Reducing agents</b> can turn rust or other corrosion back into (loose) metal. Some reducing agents are also acids.</p><p><br /></p><p><b>Ionic liquids</b> are an exotic class of materials that can actually <i>dissolve</i> metal oxides without affecting them chemically. Most are expensive and hard to work with, but some are dirt cheap (the one I fiddled with is made from two components, one of which is <i>literally</i> a major component of pee, and the other of which is <i>literally</i> a major component of chicken feed). I really, really must experiment more with this stuff.[/QUOTE]</p><p><br /></p>

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