Plumbing issues caused by tenant- Reimbursement

[April Benard]

I recently had to pay a $175 plumbing bill (a child's tooth brush was flushed down the toilet). 

The tenants are given a welcome packet stating the rules for issues caused by tenant negligence, so they are very aware of the upcoming cost.

How should I setup reimbursement? Have the tenants (tenants are Section 8 voucher recipients) pay now or take the amount from the deposit. I have saved the pictures and receipts in their file. 

Also, does anyone have a sample letter I can provide to the tenant regarding the upcoming fee?