I am having a powdery mildew issue with my plants that I move outside/inside daily. I use deluded milk in the direct sunlight to treat this and it works! I used to paint it on with a brush but now I use a spray bottle with a heavy ratio of milk, then I rinse the plant a few hours after it dries in the sun. The problem is it always comes back and moves around to different leaves, recently it gets right into my buds and I have to spray the buds directly with my milk solution then rinse them a few hours later. Why does it keep coming back? Any suggestions? I assume it keeps coming from outside as there are several other plants in my yard with white powdery mildew on them. However maybe it is coming from inside, I store my plants in my basement which is unfinished but they are inside a somewhat enclosed area but not sealed. I do not see it colonized anywhere else in the basement though. Should I do a root drench with the milk or is it just going to keep coming back when I put the plants outdoors? I do have a few plants outdoors that stay out there but they are not affected by the mildew and they are right next to a shrub with the mildew all over it...maybe it is strain dependent?