we simply just get on with it. we do say sorry if someone complains but at the end of the day who do they moan at when it rains? we offer them our services also, and usually at a lower rate but i wouldnt dry them wash them or do anything unless they were paying. theres nothing they can actually do and the people above have the right to a window cleaner. I usually warn people in flats that there neighbour below may complain.