I am looking for a subtle but effective past due letter I may use on a late paying customer that I actually want to retain. Two months ago I was hired by this customer to repair damage to his lawn caused by a bobcat used for a home addition. At that time I did some other landscape work totaling $ 800.00. Since the work was complete I received one payment for $200 and the promise of payment in full at the end of June. As I type this I am getting ready to make out next months invoices including his. Do any of you have a successful past due notice that is subtle but effective in reclaiming money due.