I had some signs of powdery mildew. The common remedy I found from various sources said to spray with milk. “As a last resort” use Hydrogen Peroxide (H2O2).
Since H2O2 is just water with an extra oxygen molecule that quickly breaks down into water and oxygen, leaving no residue, and since it is a very good sterilizer, fungicide, rot preventer, it seems that I should spray my plants on the first dry day after rain or high humidity as a harmless preventative action.
Whatcha think?