Drone spraying cleaning solution to building - GIF

Drone spraying cleaning solution to building.

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Previously:

https://www.homemadetools.net/forum/...315#post234018
https://www.homemadetools.net/forum/...950#post229871
https://www.homemadetools.net/forum/...617#post228864
https://www.homemadetools.net/forum/...189#post134687
https://www.homemadetools.net/forum/...3663#post99719

That's someone invested in keeping their building clean!

What are they spraying and does it need to be washed off? If it doesn't need to be washed off then I'm going to need some of that. My shop looks like something from Indiana Jones.