Unfortunately they will very really tell you the truth, but yes I agree with Andy, they were Christmas cleans.
We always seem to get those few that have been looking for a window cleaner when you have worked the street for years - they almost always seem to be in Dec and they mostly cancel a few cleans later. First clean double, especially in Dec or first clean in Jan usually weeds them out.
The first window cleaning call of the new year for us was a cancellation. "Their old window cleaner had turned up who had been ill for a long time."
The windows and frames were so dirty first clean that their previous window cleaner must have been ill for years. I wasn't unhappy as they were difficult to park up and sometimes had to come back later when there was a place to park. In their case, she was at her sisters when she saw me cleaning windows and he called to cancel after the second clean. Each time they were left good, so it wasn't that.
Canvass, clean, cull - excellent moto to keep you sane and in control by not taking it personally.