Job #1 is to stop the source of the leaks. Easily said, but it may be difficult to locate and costly to repair. There are no shortcuts.
In some cases, home owners may choose to ignore the issue and just live with it. Yes it’s an option but remember that the house follows the rules of entropy… the structure and finishes will continue to deteriorate.
Finally where indoor air quality is important, an environmental testing firm should be contacted to sample both the surfaces and air for mold. A remediation plan can then be implemented, from just surface cleaning to removal of compromised components.