It sounds pretty legit to me.
My silly comments are usually left-field enough that the humour is clear to everyone apart from the most uptight internet hero’s
Remember, as a pressure washers who’s been asked to “wash a building” your priority is to “wash the building” so as long as the windows look reasonable after you’re finished… that’s fine.
Leaving windows cover d in bleach streaks would be bad
Leaving windows 85% clean with a few water spots… fine.
Once you’ve cleaned the building they will probably hire a window cleaner to come every few weeks
Are you in a hard water area? If so, use a truck wash or throw a bottle of rinse aid like jet-dry into your soap.
Ebc will be fine. Any low bubbles surfactant will do