The most important thing to do is to find what is causing the mould. People tend to focus on removing the mould but if the conditions stay the same and you do not resolve the cause, it will likely return.
This is even the case if you use a specialist mould product / antimicrobial (don't use bleach BTW).
Mould in many cases is linked to (a) a source of moisture coupled with (b) poor ventilation. There are other factors, on that...
You might find this article useful for some tips about how to stop mould on walls.
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