Albert,
My problem would be the customer.6mths i okay, but i have a feeling that when you turn up it wont be right, she will want you to phone so she can okay it.She will have to be in, it will have to suit her, it may be longer than six months, and she will probably call you etc.
In view of her comments, and i'm guessing it hasn't been cleaned in a few years, she won't keep you anyway.
On that basis i wouldn't hold my breath.