I do agree with Jason. Simple, household formulas are not strong effect to kill mold. After washing with bleach or vinegar the mold may appear to be gone, but the spores are left behind and mold will continue to reappear. The easiest way to chose a good mold killing product is to check to see if its an EPA registered Fungicide. The product that I used is call Sanosil Mold and Mildew. I bought it from http://www.sanosilmold.com.
I used it and haven't seen any mold re-growth yet. Good luck to you.