I had a message over the weekend from an occasional customer on a compact estate that I do that's 25 miles away. I usually just do the front windows for her. She works in the town where I live, and paid me in advance a week or so before I went to her area, which I did last Tuesday.
In a more increasing in frequency senior moment I had forgotten that she had paid me to clean all her windows, and she very tactfully messaged me to ask if I had done the backs?
Mortified, I replied that I had genuinely forgotten that she had wanted them done as well, and offered to go back on Sunday to do them for her.
Very graciously, she told me not to worry and next time I am there will be fine.
John