How do you remove mold of interior walls?

If you are going to hang drywall in a moist area, use green board. Green board is made for this. If it is already hung, but is getting moldy, you have the option of using a base coat like Killz. Killz is made to kill mold, and prevent future outbreaks. It is not made for your final coat though. You will need to actually need to paint it after you are finished with your Killz coats.