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<p>[QUOTE=&quot;desertgem, post: 788384, member: 15199&quot;]Cyanide compounds react with gold or silver and are used in mining operations, so they are well adapted to &quot;dipping&quot;, but they were also use by the Nazi as suicide capsules, in Jonestown koolaid, and in commercial fumigation. It is still used by some dedicated old time entomologists in &quot;killing jars&quot; since it kills insects almost instantly, and it is many old time murder mysteries ( Agatha Christie) loved to use it &quot;almond smell&quot; as a plot point. Still available in US if you know where to look. But DEADLY.</p><p><br /></p><p>Years ago I used trichlorotrifluoroethane for cleaning printed circuit boards, etc. I would not expect it to take off any white spots or toning. I have not tried R-134a refrigerant ,Tetrafluoroethane, but it might work well, and is not an Ozone hazard. It can be bought at Walmart. It should be less reactive to metal, but may retain a de-greasing action. I haven&#039;t tried it, but would be n interesting experiment. It would not leave a residue and should not harm metal.IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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