The house is 20-25 years old & has through the years developed many leaks in the roof that have eventually produced leaks inside the house. Now mold & mildew have began to form on the ceiling inside the house in various areas. I have removed all the old popcorn ceiling & now my question is, On the areas of drywall that are showing mold & mildew what would be the best solution to getting rid of it?? Do I need to cut out those areas that are contaminated & replace with new drywall Or will a KILZ application cure the problem & discontinue the mold to spread?? I have soaked some of the areas with a clorox bleach spay solution, & it seems to have maybe helped but with numerous future applications.