For outdoors try a high quality acrylic sealer made for exterior use.
How to clean the concrete wall around basement exterior steps.
When groundwater consistently infiltrates the porous concrete walls through capillary action wall stains and related problems can occur.
Mix together 1 gallon of water and cup of chlorine bleach if the walls have mold or mildew.
Mold and mildew spores flourish in basements that are dim warm damp and poorly lit.
After scrubbing the walls as directed earlier scrub them again this time with a stiff scrub brush and the bleach solution.
Let the bleach mixture sit on the walls for 15 minutes then rinse the walls with a clean rag and warm water.
If you plan to paint concrete walls use a waterproof sealant first then apply stain blocking primer and paint.
For stubborn stains and outdoor jobs use a concrete cleaner with a push broom or a pressure washer to clean your concrete steps thoroughly.
Seal any cracks in the concrete walkway around your home with concrete caulking or tar.
Unless you take every step to keep the soil.
There are a variety of ways to clean concrete steps.
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.