Mold during a rehab Job -- What to do with it?

One of our previous residents moved out leaving a home with lots of black mold. Apparently, after they lived in it for a long time with a leaky roof, they decided to move leaving us with a trashed home. Now we are rehabbing the home and have found black mold in the trusses, studs, and joists. Can we just spray with chlorine? Or maybe coat the stuff with Kilz paint? Or what? How do others deal with this issue?