is there a trick to remove black mold?

how big is it? small patches on silicone or a painted wall - spray white vinegar, leave it an hour, scrub, dry it off. bleach takes the colour out on hard surfaces but doesn't reach into anything porous. if it's on plasterboard and keeps coming back, or it's bigger than roughly a square metre, it's in the material and that section needs cutting out. and either way find the damp, because mould on a cold outside wall is condensation and it'll be back in a month unless the room gets aired.