1 Total costs (materials plus shipping and labor) for installing a straight, return or L-shaped stair can run $1,300-$7,000 or more. 2  Materials plus labor for custom-built wooden stairs, such as a sweeping circular or elliptical design, can cost $10,000-$30,000 or more, depending on the size, style and type of wood.
Make another bleach solution and pour it onto the driveway. Wait 20 more minutes for the bleach to kill the mold. Rinse the driveway thoroughly with a garden hose. Prevent future mold with a borate solution. Mix 1/4 cup of borate detergent with 1 gallon of warm water in a bucket. Pour the solution onto the driveway and allow it to dry. Don't rinse it.
Wipe out any visible mold growth. In your bucket, mix a solution of Â½ cup bleach, 1 tablespoon mild dish soap, and 3 gallons hot water. Using a cloth, brush, or sponge, soak up the solution and scrub the moldy areas of your air conditioner well. Also clean the air conditioner front grille if that has mold on it. Allow the solution to sit on these surfaces for approximately 10 minutes, then rinse with water and a damp cloth.