Sorry, but I don't remember the baking soda recipe. I just Googled it at the time. I never tried the milk. I just assumed that it might smell sour in my sprayer.
For my baking soda solution, I just made up a quart hand sprayer full and used what I needed and stored the rest in the garage until I re-applied it. I don't think that this would be a good idea with milk.
I did not add any soap or oil, just baking soda and water. It didn't kill the old mildew but it seemed to keep it from spreading to the new leaves. I had the problem on zucchini.
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