Had a mould problem in last bathroom (probably for not opening the window enough). Anyway bro who has been doing houses for many years says this:- Rub off the current paint there (white fortunately) then spray the area with Polycell anti-mould spray and let it dry before repainting. He was right, in the six other years we lived there the mould never came back.
Mould is from high moisture in the air hitting cold surfaces. Leaving wet items in the house ect.
It's the high moisture in the air that is the problem. Deal with that.
Old damp walls also need dealing with if you have them
Anti mould paint is not dealing with the problem.
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