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Mold and mildew can grow on a variety of surfaces if conditions of dampness and poor ventilation are present. It's easy to tackle and defeat mold and mildew with simple household products such as Clorox or other bleach brands. The correct proportions to use vary depending upon the type of surface you'll be cleaning.
For stubborn stains on hard surfaces such as stone, brick, tile or grout, mix equal parts Clorox and water in a plastic utility bucket. Apply the mixture directly onto the area you're cleaning with a scrub brush or pour the mixture into a household or garden sprayer and spray it onto the area to be cleaned. This is a fairly strong mixture, so wear rubber gloves if you have sensitive skin.
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To remove mildew and mold on surfaces such as unfinished wood or wallboard, prepare a mixture of 2-3 cups Clorox per gallon of water in a plastic bucket. Dip a sponge into the mixture and rub it onto the surface you want to clean. If necessary, use a soft brush to scrub difficult stains.
For cleaning mold and mildew off of fabrics, use a diluted mixture of 1 cup Clorox per gallon of water. Test the mixture on a hidden area for colorfastness, then scrub the affected areas with a sponge dipped into the Clorox-water solution.