R2d2420started grow question 3 years ago Gelato auto 4x4 tent. Tempe 78 & humidity 57%. Had a problem 4weeks in whit powdery mildew. Sprayed it with water 80% , milk 20% & a pinch of Epsom salt. Did it for 5nights out of 6. After a few weeks mildew free,The mildew is back at flowering stage what should I do?