Sidewalks are the pedestrian highway.  Sidewalks parallel most major streets in Phoenix.  Sidewalks are the entryways to all business and sidewalks run along most residential neighborhoods.  Sidewalks all over Phoenix are cover with gum, bird droppings, food and drink spill, oil, grease, dirt and other miscellaneous stains.  All these sidewalk contaminants can make the walkway 
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