Powdery mildew orany type of mold thrives in acidic enviroments. Change the micro-enviroment into an alkalinic one and their growth is stopped and their organs collapses. Raising the tremperature to 75 degrees F is above the mold's ideal. Here's a list of products effective against mold:

AQ10
Cinnamite
Milk in a solution of 80% water and 20% skim milk (can be used repeatedly)
Neem oil
Plant Sheild
Potassium bicarbonate
Serenade
Sodium bicarbonate (baking soda) (Do not use repeatedly because it causes the build up of sodium)
Sensi Super Skunk Reviewed by Sensi Super Skunk on . bud question howdy. if you were to harvest, and your plants had a case of powdery mildew, could you simply spray ( wash ) it all off before hanging to dry? or is the crop ruined??? Rating: 5