It's sad when this happens. I remember a nice old dear that was a customer years ago. She went downhill really fast. She was always singing my praises about how happy she was with my work, then one day I was up the ladder when she asked me what I was doing. When I replied, she sharply said that she had never had a window cleaner. She had a sister,who was also a customer, and she also succumbed to Alzheimers.
John