Lance Brew is a custom bicycle frame builder. Runs a class to DIY your own frames, does boutique frames, etc. He posted a first hand account once of a mistake someone made using chlorinated brake cleaner. It's pretty scary to read...
https://www.brewracingframes.com/safety-alert-brake-cleaner--phosgene-gas.html
https://www.brewracingframes.com/safety-alert-brake-cleaner--phosgene-gas.html