mildew and moss on asphalt driveway
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Clear up Mold, Mildew, and Moss: Fix it Now

On most hard surfaces (test first), apply a solution of 1 part bleach to 10 parts water with a spray bottle or a mop and wait 10 minutes. Follow with a stiff brush and a garden-hose sprayer or use a pressure washer to dislodge whatever's left, and rinse.
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