I think that their basic technique is to crawl along the ceiling as seen here, then aim the thing in a general downward direction.
Having cleaned ladies rooms in a department store when I was in college, all I can say is some women go to great lengths not to have to touch the seat.
They call it “hovering” down here.
I think that their basic technique is to crawl along the ceiling as seen here, then aim the thing in a general downward direction.