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Borax is used for flushing large coolant systems. The green dye is probably to find leaks or identify when the flush has cleared out any residual coolant.
Ah, that makes more sense then.
But lye as well?
Edit: never mind, that discussion says also lye.
They use this mixture at my work as well. Flushing out large sub freezing cooling systems. We don’t dump it out on the street though.
If it’s anything like the places I work, they specifically tell you to be very careful about what you wash away.
