After you have performed the rehearse evacuation operation successfully to verify if all your assets from the production data center can evacuate to the recovery data center, you can use the cleanup evacuation rehearsal operation to clean up the rehearsal virtual machines and its volumes in the VBS or resiliency groups.
All temporary objects that are created during the rehearse evacuation operation are now deleted.
During the rehearse evacuation operation, if any virtual machines are in ERROR state, then during the cleanup evacuation rehearsal operation, these virtual machines and their volumes are not deleted. You need to manually delete them. Similarly if the recovery data center is Cloud, then manually delete the instances which are in ERROR state.