Bleach, straight from the bottle will kill any and every mold. I had a similar problem and I solved it by getting a Heavy Duty bug sprayer (holds a gallon) and filled it with bleach. Then I went up into the attic and sprayed the sheet out of it. Made sure every piece of wood was wet with bleach. I had to wear respirator because of the fumes, but it did the trick, Not a hint of mold left then we put in the ridge vent.
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