When groundwater consistently infiltrates the porous concrete walls through capillary action wall stains and related problems can occur.
How to clean the concrete wall around basement exterior steps.
Thin black and white fungi growth spreads over cement basement walls and leaves behind a musty odor.
Let the bleach mixture sit on the walls for 15 minutes then rinse the walls with a clean rag and warm water.
To clean concrete surfaces safely and effectively begin with the least toxic cleanser and up the ante as needed.
Mix together 1 gallon of water and cup of chlorine bleach if the walls have mold or mildew.
After scrubbing the walls as directed earlier scrub them again this time with a stiff scrub brush and the bleach solution.
Seal any cracks in the concrete walkway around your home with concrete caulking or tar.
Unless you take every step to keep the soil.
For stubborn stains and outdoor jobs use a concrete cleaner with a push broom or a pressure washer to clean your concrete steps thoroughly.
For mild cleaning spot cleaning and or indoor cleaning use a mild dish soap and a stiff bristle brush to remove stains from your concrete steps.
Since many basements contain high moisture levels they are often installed with cement cinder block walls.
For outdoors try a high quality acrylic sealer made for exterior use.
Therefore the first step to correct any type of basement wall stain problem is to provide adequate foundation drainage in order to minimize the water infiltration.