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" My daughter, who lives in Seattle, has cement steps with moss growing on them. How can she clean it off?-- Barb DeWitt, Rockville, MD  With the humid, rainy weather in the Pacific Northwest, I can imagine that this is a recurring problem. Fortunately, there&amp;#039;s an easy, environmentally safe way to deal with it, using my favorite household solution: vinegar! Pour it full strength over the moss. Let it work for five to 10 minutes, then scrub, rinse and let dry. If any green remains, reapply vinegar and don&amp;#039;t rinse it off. If there&amp;#039;s still a problem, scrub the steps with a mixture of 3/4 cup household chlorine bleach and a gallon of water. Let stand for 10 minutes, then rinse. Be careful the mixture doesn&amp;#039;t leak onto plants -- it could hurt them -- and do this on a cloudy day, because the sun will cause the bleach to dry too quickly. To prevent moss buildup, clean steps regularly with vinegar. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.goodhousekeeping.com/home/cleaning/tips/a2452/get-rid-moss-aug02/>