You can do everything right in your garden and still have problems, including powdery mildew. Keeping your plants healthy will help minimize damage, but sometimes you need the aid of a fungicide while other prefer a different approach: using milk spray. Although it's still uncertain as to exactly how milk works against the fungus, milk protein creates an antiseptic effect when exposed to sunlight, which is why you should apply the solution in bright sun. Milk works best as a preventative measure rather than as a cure so spray your susceptible plants as soon as the prime mildew conditions are setting in or when foliage first begins to show signs of mildew.

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Source: The Spruce