some i get back,some dont want a window cleaner,others are messers and get dropped and sometimes they "import" their old windy from a previous address,occasionally another windy picks them up when canvassing/leafleting,etc.
all our rounds are built on shifting sand.im always picking up a steady trickle of new jobs here and there too so it balances itself out.9 times out of 10 i also charge a little bit more for new jobs too so over time my round gets that little bit more profitable.