DIY Powdery Mildew Spray Recipe

Powdery mildew can kick rocks.
In preparation for gardening season, I'm sharing a recipe I've developed over the past several years. This spray has successfully been used to treat zucchini, pumpkin, squash, etc.
You can apply it once a week before the dreaded mildew inevitably shows up, but I usually end up treating once I see the first mildew spots. I've used the spray to stop mildew in its tracks, or at least keep it at bay long enough for everything to ripen. Of course, it's best to treat as soon as possible. If a plant is overcome with mildew spots, it's less likely to help as much.
The pics attached were taken in late summer. These vines were ultimately killed by frost, but not by mildew.

(For safety's sake, I recommend testing the spray on one leaf and checking the next day before using on entire plant.)

For 32 ounce spray bottle:
1 cup milk (skim, 1%, 2%) 3 cups water (or 4 cups water + 3-4 tablespoons dry milk powder) 1/2 teaspoon baking soda couple drops of dish soap 1/4 teaspoon neem oil (optional, but recommended)

Shake well and spray to tops & undersides of affected leaves. Repeat daily, or at least every other day until mildew stops advancing. Application frequency will depend on severity of mildew or if rain keeps washing the spray off. Store any leftover spray in frig.
Hope it helps!