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From what I’ve been told, it takes large amounts of any fluid to get it to go away. One difference you may have observed with milk was that it was cooled vs room temperature water. Cooled water can have similar effects compared to cool milk
Or the time factor itself since it was the second thing used
That’s what people claim, but the research on it suggests it does not do any better for tear gas or pepper spray. Here’s one study looking at pepper spray for instance:
https://pubmed.ncbi.nlm.nih.gov/18924005/
EDIT: Also worth noting that in terms of infection risk, bird flu is now in a large number of dairy samples and it appears like it transmit to humans through the eyes in particular (or at least be one of its transmission pathways).
https://www.scientificamerican.com/article/why-bird-flu-is-causing-eye-infections-in-dairy-workers/
Some types of pasteurization (flash pasteurization) might not fully get rid of all of the virus. So for even just bird flu alone, its likely more of a risk than it probably was in the past