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.
Spray a second time with white vinegar to dampen the caulk before cleaning. Moisten a scrub brush with hot water and an ample amount of baking soda. Use gloves to protect your hands from the hot water. Scrub the caulk with the brush and baking soda.Scrubbing hard is important to clean off the mold.Rinse the area with water and examine for any signs of mold. Gather the old caulk, and place it in a garbage bag. 2  Let the tub dry completely and apply fresh caulking. 3  Wear a face mask to prevent inhaling mold spores. 4  Mold spores can cause an allergic reaction in some people.