How to Clean Concrete Walls
- 1). Fill a 5-gallon bucket with cold water and add a cup of mild soap (dish washing soap or laundry detergent will work). Dip the brush into the soapy water and scrub the stain until it disappears.
- 2). Empty the bucket and refill with cold water. Add 1/2 cup of ammonia to the water and clean the stain with the brush using the ammonia solution. Scrub the stain until it disappears.
- 3). Mix kitty litter with water to form a poultice. Spread the poultice over the stain. Cover the poultice with a plastic bag (this will keep the poultice on the wall) and duct tape the bag to the wall. Allow the poultice to draw out the stain for a few days and then brush off the dry kitty litter.
- 4). Clear away all furniture and objects next to the concrete wall and spray the area with a pressure washer. This should only be used in the event of a stain that won't come out using other methods.
