Ability to purge attachment files from our iExpense & AP invoices

We have a requirement to purge our old attachement files from our AP Invoices and iExpense.

Currently our AP business team scan and attache the actual supplier's invoice document to our AP Payable invoices.

Also, our iExense users attach their expense receipts when they submit their expense reports.

I would like to know If any of you has already done the purge processing for attachmenet documents that are uploaded via the various Oracle application forms such as iProcurement, iExpense, Payable & Purchasing applications.

Is there an Oracle out of the box processing for this Oracle document purge processing?

Is this a custom processes that we should develope on our own? We know all Oracle attachement documents are stored in Oracle's FND_LOBS table.