Blind window cleaners

So I was on a big job the other day, and while working, a Pella certified tech came out to clean between the panes on some Pella storm-style windows. The problem was that he couldn’t really see. He was using sprayaway and kept asking me if there was residue left. I pointed out huge patches all over the place and ultimately ended up cleaning them with my gear.

How do people that have vision problems keep work going?

Anyone else know window cleaners that can’t see? This sounds weird, but it happened. I guess it’s like being a deaf dj?

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