sorry but dont get these threads really.
I'm in business, the business of cleaning peoples windows for money.
I often call to quote and ask if reg or not (in a friendly manner)
the customer has the choice and so they should, now if its not going to be regular I have an "as and when charge" and bung a few quid on top. Customer can take or leave it, they usually say yes to either, I clean there and then as I've already driven there to quote and I get given money.
All. work, regular or not in my opinion raises my profile and can often lead to other enquiries.
Dont get me wrong FTP I'm not knocking you personally, from your previous posts you sound like your snowed under and have a full round anyhow, but I've a few new regulars of late who have had previous cleaners with smug and often rude attitudes that I imagine came from similar scenarios.
What I think people often forget is that in a customers eyes we are total strangers and they are inviting us on to their property, its down to us to make them feel at ease, conduct ourselves in a friendly and professional manner, do a good fair priced job and gain their trust.
or maybe they are just a "pita" in which case tell em to stick it !