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A few house-cleaning diehards might bring Ziplocs of crushed eggshells, ground corncobs, or volcanic ash to the White House Visitors Center this morning. But although today’s event is titled “Kermit Was Right: It’s Not Easy Being Green,” it isn’t an attempt to make the West Lawn one big compost heap—or even to protest George W.’s environmental policies. Instead, the to-do will really be about persuading Nicolas Veloz that ground-up walnut shells ain’t the only suitable abrasive to polish the monumental noses of our nation’s forefathers. A former National Park Service cultural resource specialist, Veloz is an expert on cleaning monuments and memorials. Baking soda removes graffiti on statues, he’ll tell you, but it also leaves its own mark on stone. Ask Veloz if almond shells—or eggshells or corncobs—might be a good substitute for the walnuts at 11:30 a.m. at the White House Visitors Center, 1450 Pennsylvania Ave. NW. Free. (202) 208-1631. (Elissa Silverman)