This is a complex question and can have many answers. Infrequently, mold has taken root within your home and it will require professional remediation by licensed and trained contractors. This can be complex and, sometimes, costly work. Most mold remediation projects are relatively small and inexpensive to fix. In many cases, a homeowner can clean the mold themselves (i.e., when the mold covers less than 10ft2 or there is no risk of hidden damage).