powdery mildew

i have developed the white blotches on my fans. under the magnifine glass it looks like a pile of trichs.
im asumeing its mildew, does anyone have a remidy for this,as i see it starting to spread..

I've had great success with Serenade. It's a bacteria that eats the mildew, then dies off - totally gets rid of it. I now use it as a preventative - spray once, before flowering, and never see a sign of it anymore.