For all the effort you’ve put into trying to convince people that water is the answer, it’s reasonable at this point to ask you to try it yourself. Get yourself some pepper spray from the store, and then spray your skin. Try to wash it off with water. Wait until you’re in sufficient pain and the water clearly didn’t do anything, then try milk, and feel your pain evaporate. You can do this experiment in less than an hour. Report back when you’re finished, or you can delete all this misinformation. Whichever.