Does anyone know what those dark splotches of grime are on every sidewalk in every city in America? I live in the mid-Wilshire area of Los Angeles, and the sidewalks are, comparatively speaking, spotless until you get to intersections and all four corners are covered with these little circle of shmutz - so it has to connected to human activity, right?
Posted by Bauhaus I on September 17, 2012 at 3:34 PM
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