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I don't think we would get away with charging anything when we have been informed in advance that they don't want their windows cleaned.

Customers are free to choose when they want their windows cleaned or not - we can't force them or impose T&Cs on them.  They are in control of this.

We can control whether we retain them as customers or not.  

I do think it's good practice to inform customers in advance when I turn up and I know many of my customers like this.  If there are any cancellations, I would rather be told in advance.