Automating the deletion of Unsubmitted requests in vRA 6.2.4

Hello,

We have pages of un-submitted requests in vRA v6.2.4 that require us to periodically/manually (one-by-one) delete them.  For some of the older requests, the VM doesn't even exist anymore so we get an error when attempting to delete the request (so they are not delete-able from the GUI).

Is there a way to delete these un-submitted requests automatically, say after 30 days?  Perhaps using a scheduled task in vRO? or via a feature in vRA I'm not aware of?

Thank you,

Rob