Green spores on wall. Mold problem?

Hi,
It looks like we have a mold problem in one room of our house and I am wondering what can be done to prevent/cure it? The room is adjacent to our (open) kitchen and the mold statrs in the corners and works its way up the wall (it's an exterior wall). We clean it regularly with some warm water and washing-up liquid but it always returns.
We've bought a small de-humidifier but this doesn't seem to be helping much. In the past we used to dry clothing over the radiators but we've stopped this recently too as I'm sure it was a contributing factor. Is there anything else that can be done to stop these mold spores coming back?
Matt
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Use bleach to kill it , Are you in a warm area? If it comes back realise mold needs moisture to grow , it could be a minor leak or condensation.
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Matt wrote:

Warm climate? Air conditioning? What kind of surface - paint, wall paper, etc? I'd clean it thoroughly with household detergent, water and a bit of bleach.
You could have just poor air circulation, with humidity and cooking fumes accumulating close to the kitchen. Got an exhaust fan? There could be a leak with moisture getting into the wall from unsealed window, gaps in fascia or roof leak. If the wall is not adequately insulated, you could have condensation if the outside of the wall is cold, but it wouldn't seem likely to start in the corners, as they should be more solid. Look for the logical - mildew needs food and water to grow. If there is a leak from outside, then the mold is probably IN the wall, not ON it. I'd start by keeping it dry and circulating the air better. Always do a regular walk-around to check openings or need for paint on the exterior. Little openings are big entries for water and pests. Is this a laundry room? Dryer vent secure?
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