You guys are talking baking soda + neem seed oil + soap+water? That's what I been using to treat the powdery mildew, I have 2 large fans blowing 1 small one, dehumidifier set to 30%, and 400cfm inline exhaust fan, and two 190 cfm intake fans.temps are 74F during lights on , 72F during lights off, humidity is 40% constantly. Just spotted another patch of PM on the goat today sprayed the baking powder/neem/soap mix today and wiped up afterwards as to not have humidity spike. Any other suggestions are welcome thanks . Oh and my intake has a HEPA shroom shroud on it.