Might have been a good idea to equip the robotic arm with a soft brush
Mars Rover Selfie! A self-portrait of our Mars Exploration Rover Opportunity taken in late March 2014 (right) shows that much of the dust on the rover's solar arrays has been removed by wind since a similar portrait from January 2014 (left). Cleaning effects boosted the amount of electricity available for the rover's work. More: http://www.nasa.gov/jpl/mer/solar-panel-selfie20140417/index.html#.U1BaRPldWSq
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