How can I kill the mold on the wall?

how can I kill the mould that is on the wall and has now transferred to my new curtains, they cost so much and I am afraid they are spoiled well its just the lining at the moment I wish I could get the mould stains off them, it isn't looking good.I've bleached the walls and the mould has faded I have an old house no damp course but I do have heating, good ventilation (its so drafty badly fitting doors and windows) also just got an ebac dehumidifier in situ , can anyone help with some advice please ?

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