Try this
Dear Customer,
You rented a "cleaner" from our store on Nov. 21, 2007. It was due to be returned on
_(Date)_. The item is now past due. Please return this item immediately. The over due charge for this item is $15.00 per day and replacemnt cost for this item if lost is $200.00.
Thank you for your prompt attention to this matter.
Sincerely,
R