we've got mould on of 2 of our bedroom walls, we clean it off with bleach regularly but it comes back very quickly.
I looked at the mould killer sprays etc in tesco but they all say not to be used on porous surfaces, only on tiles etc. what can I use on paintwork, is it possible to actually get rid of mould totally?
one patch is in my daughters room, next to her bed and I clean it off very regularly but it keeps coming back and I'm so worried its going to harm her lungs, she's had so many coughs recently 
it's black spotty mould.