Wall should be cleaned once a week. If the wall is a wooden board to be cleaned using a rag to wipe the dust off. The joint board is stacked with dusty. Then use a feather duster, broom again, then wipe with a damp cloth twisted around. If the wall is plaster can be used to gently sweep the broom grass. Then use a damp cloth to wipe If very dirty as dirty oil. Use a sponge or a brush with detergent water and wipe dry using a clean decay.