Question

Extract who is not fit for dusty earth

Answer 1

Answer:

Simplest idea that comes into my mind - go to the nearest garage shop and buy the car's wipers set: wipers, cleaning liquid tank, sprayer, wipers motors, relay, etc. I think a regular solar panel has the approximate size of a truck or a bus windshield, so you can use the corresponding components. I find it a reliable and cost-effective solution because it utilizes the well-known and available parts with minimum investments.