How to clear the SyncIssues and LocalFailures directories forcibly and for everyone?

Question

Mail server

Good afternoon.
It is necessary to clean up the directory with synchronization errors on the client side. I found a solution to clear the mailbox from the Outlook interface, but the LocalFailures directory on the server was not cleared for the most problematic client. Secondly, I would like to go through all the boxes on the server side.

A purge policy has been configured, but it is my understanding that it will not affect data written before the policy was enabled.
Is there a mechanism to force the cleanup of SyncIssues and LocalFailures for all mailboxes on the server?
You can even use the entire catalog without saving data for the last period.