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I wouldn't be surprised if the wanton use of brake cleaner you describe was using the non-chlorinated variety. Both exist, e.g.:

https://www.amazon.com/CRC-05089-BRAKLEEN-Brake-Cleaner/dp/B... vs https://www.amazon.com/CRC-05089-BRAKLEEN-Brake-Cleaner/dp/B...

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I note that this and the Nulon brand that I’ve used list TETRAchloroethylene rather than trichloroethylene as a constituent. I wonder if that’s any safer. The Wikipedia page[0] says it has been described as a possible "neurotoxicant, liver and kidney toxicant, and reproductive and developmental toxicant ... a 'potential occupational carcinogen'"

[0] https://en.m.wikipedia.org/wiki/Tetrachloroethylene

That stuff is real good for getting stains out of clothes

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