Trichloroethane 1,1,1,Tech has been "outlawed" in the States for years. But it can still be found with a little digging. The military still uses it, but under tightly controlled circumstances. It is extremely hazardous to work around, and if heated will remove air from water. I have high exposure from way back when it first replaced carbon tetrachloride. Just a couple of breaths will give a hell of a buzz. But it penetrates the metal, something no other solvent will do.
High temperatures (welding, etc) and water must be avoided. Either will generate phosgene gas.
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