Engineering360: "A drone for cleaning solar panels is on its way"

I see nothing stating how much fluid capacity this drone carries in order to clean a panel. This surely smacks of toy and a game in order to reduce employing people to do a simple job. I'm afraid all this tech has become silly and pointless. clever but pointless in my opinion.

If we keep reducing jobs for people, just who will these robots be employed for if there are no people left to accept the services? The only idiots who will need electricity will be the robots.

Maybe they could fly the drone close to the surface and let the downdraft blow the dust off...