I think the thing about cleaning windows in the wet is that whatever the results, whether they remain clean or not, MOST people DO NOT work in the wet, whoever you are, brickie, gardener, whoever. We are conditioned to avoid the rain, understandably so, so when someone who isnt providing an essential service chooses to do so others think theyre possibly a bolt short of a full set.
For me if it gets to the stage where I feel obliged to go out there in nasty weather I have to expect the odd comment.