Be careful with chemicals guys.

When I worked for the tiny HVAC shop in spokane, they bought ivory liquid "look alike" detergent for stuff around the sink, and we had boraxo powdered. THAT mixture could REALLY get into a cut and wake you up!!!

But the real deal ya learn REALLY fast is that all the old school refrigerants like R12/22/500/502 etc when you are brazing fittings--when you run that stuff "through a fire" it generates PHOSGENE. Same stuff as used by Hitler in the camps.

And several "brake clean" like solvents do the same thing. Using some of these cleaners before brazing or welding can generate toxic gas