Ok so I tore apart my bathroom and behind where the tub/shower was, there was a little black mold, on the drywall and on the 2x4s. I was getting rid of the drywall anyways so thats gone. On the other side of the 2x4s (so same wall but just other side) is a sitting area and that was just refinished, so I dont want to have to take out the 2x4s and put in new ones or else it will wreck the wall on the other side. Could a guy use bleach or something for the little bit of black mold thats on them then continue with my bathroom renovation? Or is there something they make that i could spray on the black mold to get rid of it? I really dont want to have to replace them and have to redo the sitting area again.
A 10:1 water bleach solution will get rid on the mold. Allow it to completely dry, then install 6 mil plastic to that wall after insulating. Insualtion is good for either an outside wall in inside wall. Inside, it reduces noise. Then backer board and tile.
As mentioned above, a 10-1 mix of water and bleach. Clean the mold off. When dry, spray or brush a sealer on the studs. The sealer will lock down any stray mold components that the bleach coudn't reach.