He must have missed the day at trade school upon which they covered “vital supplies for a window guy” and high on the list most certainly had to be “Windex or other glass cleaner.”
So I rooted around under the sink and found, then handed him, a nearly full bottle.
That was yesterday.
They are still finishing up the windows today; he hasn’t offered the bottle back. Then again, he hasn’t asked for a roll of paper towels, either. Maybe that’s next.