I have been battling powdery mildew for sometime within my grow room. It all began when they were clones inside my house, the humidity would get into the 50's. Now that they are in the grow room the humidity only gets to about 40. Nevertheless, I have powdery mildew and it's not going away. I just used a Fungaflor Bomb (Fungicide bomb) and the mildew still appears white in color and its just as prevelent. The bomb even burnt the surfaces of all my leaves. What can I do to remove the mildew safely? It covers nearly 3/4 of my plants leaves!! I still have 3 weeks in veg left before I'm gonna flower so it needs to be gone or under control before they flower!!