The windows in my house where covered with black mold....it caused me to have severe headaches that lasted for days. Excedrin wouldn't touch 'em...I finally tired a sinus headache allergy pill....those worked. Also, besides the headaches, I was depressed and felt like my memory was mush. Supposedly theres no proven evidence that mold can cause depression. I would disagree. Black mold makes me mental. I sprayed a mixture of bleach and water on the window sills. Seems to kill it.