Thanks Mark Stock. Taken a bit from yours.
Its a few that forget and then always question DOUBLE payments.
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Dear Customer
Thank you for choosing to pay online. Please note your window cleaning bill is due for payment.
Please could ensure your payment reaches us before your next window clean.
Kind Regards
Me
Sorry mate the text doesn't make sense.
You are thanking them for paying online, but they owe the money.
I would say something like this mate..
Dear Customer,
Please note your window cleaning bill is now due for payment, and needs to be settled as soon as possible.
You can do this online via BACS, immedialty and quickly for your conveneicnece. (spelling I know...)
Kind Regards
xxx
(these are not kisses)