those types are few and far between
i rarely get complaints , but a few months ago i had one acuse me of not doing the back as when she got home the windows were dry and shed only been gone for an hour... (it was ahot day)
i asked her if they were clean?... yes she replied ....but they are dry so you have not done them....iv been doing her windows for 5 years...
thing is i do her neighbours either side and she pays...she also said that i had missed the backs of her neighbours
coz they were also dry
... anyway i got paid but i will never go back, as i even did the backs again for free....
but the following month i picked up 2 more jobs in the same street of greater value