To speed up the job try a mold cleaner specially formulated with mold killing ingredients.
What to use to remove mold on walls.
How to stop mold from growing on walls.
Sunlight is a natural mold killer.
Then adopt the following practices to keep it from returning.
Bleach can remove mold found on hard plastic metal and another non porous surface.
For more porous surfaces like drywall just use a rag so you don t damage the surface with more abrasive cleaners.
Mix a solution of one part bleach to three parts water in a spray bottle and thoroughly saturate the moldy areas of the wall.
Scrub the surface mold stains from walls and wood trim with a mixture of one quart water and 1 2 cup bleach mold cleaner to kill the mold.
Open a window and or keep a fan.
Use a soft brush and work until signs of the mold disappear.
If the surface is too porous to remove mold completely such as in ceiling tiles you may have to replace it.
To get rid of mold on walls permanently remove it using the steps above.
After scrubbing the surfaces allow the bleach solution to continue to penetrate the surfaces and dry.
If the mold build up is on the outer surfaces of your walls you can safely and conveniently get rid of it using a few solutions like detergents vinegar baking soda or commercial cleaners find more info here.
Basically removing mold behind walls is the same with how to treat mold on wood studs.
Most homeowners believe that using bleach on walls will kill mold and solve their problem.
If your basement has windows and doors open them a few minutes each day to allow air to circulate.