I've got a customer who I've clean their windows about 3 times now(once every 2 weeks) who have told me that the last time I cleaned the window above the front door it broke their front door bell and could I not WFP clean that window again.
The bell was attach to the front of the door so the water does run over it and it's a battery operated one so it's possible the water shorted it out. Has anyone come across this before