India, China: Clean dust, pollution off solar panels every two months, and still lose up to 35% of production?

How often do you clean your solar panels? Spare a thought for the poor sods in the Middle East, India and China, where migratory dust coats solar panels and hangs around in the air, blocking incoming sunlight. Researchers in India who cleaned their panels every few weeks and discovered that they got a 50% jump in efficiency each time.

Source: India, China: Clean dust, pollution off solar panels every two months, and still lose up to 35% of production?