I just had my first run in with white powdery mildew a month or so ago and I use this stuff called "Green cure" fungicide($25)...Ive been applying it about once a week(and I apply the shit out of it, EVERYWHERE DRENCHING) for the last 4 weeks of harvest just to keep the WPM at bay, its hard to completely eliminate it while growing if not impossible w/o sulfur burner, but the green cure doesnt taste as bad, I plan on giving a final hand wipe w/ green cure the day before cut, then when there hanging Im going to use this final wash spray to rinse them off thats suppose to help get everything off, cant remember whats it called though...