By microfabrication process, University of Washington Electrical Engineering (UW EE) Professor Karl Böhringer and UW EE graduate student Di Sun can create micro-sized patterns on a glass surface. By vibration, water droplets can be guided along the patterns and clean away surface contaminants. In a handout, the pictures on the top show their first prototype. Under vibration, a water droplet follows a zig-zag pattern, cleaning the contaminants on a flat surface within one minute. Each water droplet can carry up to 2mg of sand particles. The researchers plan to integrate more capabilities with their demo system, including a water condensation system to collect water from air and a water micro dispenser system to dispense water droplets automatically.