Hi Martin,
Not a dig, but this happens in nearly all aspects of the industry, we, as professionals should educate the client in the realities of life.
Most, so called cleaning contracts are poorly written, and few, even those in the "Trade" so to speak have any real idea on how to write a cleaning specification!
As I understand it, you do an awful lot of EOT cleans, perhaps you should write up a generic form to e-mail/fax or hand your prospective clients, they would then be solely responsible for deciding on what is and isnt included, this would, in my opinion, serve 2 very important purposes:
1. There would be a written record of what the cleaning specification ordered was, this would mean an end to claims for re-doing work or monetary compensation.
2. On receipt of the signed specification sheet, a quick call to the client to ensure that they understand the specification, and your professional opinion on what they have decided to leave out, would enable you to complete the work to the required standard/budget.
Regards,
Rob