black mold

Hi All, I’m in the process of completely removing an en-suite bathroom, and while taking off the tiles, I’ve come across some big holes (not caused by tile removal) and patches where the plaster has come off. I’ve also spotted some black mold, which is concerning. I haven’t finished yet, so I’m...

Can anyone recommend any products they have used to successfully get rid of black staining on stone? I think it's black mold and Google results tell me to use bleach and a scrubbing brush but I'm hesitant on using any bleach. Any tips would be greatly appreciated!